Develop Bugs

[Q] Accidentally flashed a GSM RUU onto my CDMA One M8.

Now rebooting the phone only takes me in to the bootloader. I cannot load into the stock recovery or TWRP, and I error out every time I try and flash an RUU.
I have contacted HTC support and they said to run the .exe version of the RUU for my phone, which gives me error 155 unknown error (I know it has to do with the partitioning).
Is there anything I can do to fix this or is my phone basically bricked/dead.

See if you can find the firmware.zip that corresponds to the RUU for your device. If so, then flash the firmware, then try the RUU again.
I'm not sure if this will work in this specific case. But its how other folks were able to resolve the partition issue going from GPE to Sense (GSM M8).
I assume you have s-off, since otherwise the "incorrect" RUU never would have run in the first place?

redpoint73 said:
See if you can find the firmware.zip that corresponds to the RUU for your device. If so, then flash the firmware, then try the RUU again.
I'm not sure if this will work in this specific case. But its how other folks were able to resolve the partition issue going from GPE to Sense (GSM M8).
I assume you have s-off, since otherwise the "incorrect" RUU never would have run in the first place?
Click to expand...
Click to collapse
Yes, I'm s-off. It was a total accident. Never meant to run it.
I've tried every combination of flashing I can think of.
I have downloaded the firmware and RUU from this thread: http://forum.xda-developers.com/showthread.php?t=2729173 but they did not work.
I can use my old m7 for now but its got a cracked screen
I'm so mad at myself for this.
EDIT: Now I'm looking I notice a combination of stuff on that thread I haven't tried. Guess I'll keep dicking around with it. Not much worse I can do to the thing now anyway.

Full stock Dev Ed M8 won't take OTA or RUU for MM

I have a Dev edition M8 that i zip RUU'ed back to lollipop. i took a security update successfully, then the 3 preinstall updates in prep for marshmallow. however, I now get an error when taking the actual OTA for marshmallow. I am s-off and bootloader unlocked. I then downloaded the RUU from HTC to run the exe, but i always get error 155. I read @Sneakyghost post about firmware and it said it was either region ID's not matching, or the bootloader being unlocked. I don't see why the unlocked bootloader would be a problem when im s-off and its a dev edition, which is bootloader unlocked out of the box. Anyone know what is causing this?

fyarf said:
I have a Dev edition M8 that i zip RUU'ed back to lollipop. i took a security update successfully, then the 3 preinstall updates in prep for marshmallow. however, I now get an error when taking the actual OTA for marshmallow. I am s-off and bootloader unlocked. I then downloaded the RUU from HTC to run the exe, but i always get error 155. I read @Sneakyghost post about firmware and it said it was either region ID's not matching, or the bootloader being unlocked. I don't see why the unlocked bootloader would be a problem when im s-off and its a dev edition, which is bootloader unlocked out of the box. Anyone know what is causing this?
Click to expand...
Click to collapse
Haha nice man I just finished downloading that exact RUU and I have that exact phone in the exact same state. I got it from someone in the US.
I'll let you know how it goes on mine...

Sneakyghost said:
Haha nice man I just finished downloading that exact RUU and I have that exact phone in the exact same state. I got it from someone in the US.
I'll let you know how it goes on mine...
Click to expand...
Click to collapse
heres my recovery message, just to maybe help troubleshoot it. it mentions userdata being busy (i got an error in the zip ruu flash for userdata, had to flash the ruu zip twice to get an okay), then kidmode missing. not sure what to do besides flash the firmware from http://forum.xda-developers.com/htc-one-m8/development/rom-stock-unlocked-developer-sense-7-t3262894

Modified system apps, sir. That's what it is. Did you root your system?
Edit:
Maybe not. Maybe just can't find those apps cuz it can't mount data.
Something wrong there.
No idea.
I'll see where I end up.

Sneakyghost said:
Modified system apps, sir. That's what it is. Did you root your system?
Edit:
Maybe not. Maybe just can't find those apps cuz it can't mount data.
Something wrong there.
No idea.
I'll see where I end up.
Click to expand...
Click to collapse
i did a factory reset from stock recovery, and kid mode is present now, maybe im onto something...
Edit: not rooted directly from a factory ruu zip (well, hopefully the zip creator did a factory dump and was unmodified) but kid mode wasnt an option before the factory reset

fyarf said:
i did a factory reset from stock recovery, and kid mode is present now, maybe im onto something...
Edit: not rooted directly from a factory ruu zip (well, hopefully the zip creator did a factory dump and was unmodified) but kid mode wasnt an option before the factory reset
Click to expand...
Click to collapse
Unfortunately, I'm with family tonight and won't be able to assist until much later. But note this: the factory reset could well help. I can explain later.

Sneakyghost said:
Unfortunately, I'm with family tonight and won't be able to assist until much later. But note this: the factory reset could well help. I can explain later.
Click to expand...
Click to collapse
ok so i got mine to work.. apparently the zip RUU isnt good. i ran the exe 4.16.1540.8 from here http://forum.xda-developers.com/showthread.php?t=2701376 and then updated ota from there without issue. so my guess is the RUU zip wasnt perfect system-wise,while the exe is straight from htc.

fyarf said:
ok so i got mine to work.. apparently the zip RUU isnt good. i ran the exe 4.16.1540.8 from here http://forum.xda-developers.com/showthread.php?t=2701376 and then updated ota from there without issue. so my guess is the RUU zip wasnt perfect system-wise,while the exe is straight from htc.
Click to expand...
Click to collapse
ok. Where you got that zip from? Cuz I downloaded the 6.xx RUU.exe straight from HTC USA...

Sneakyghost said:
ok. Where you got that zip from? Cuz I downloaded the 6.xx RUU.exe straight from HTC USA...
Click to expand...
Click to collapse
zip was from the same thread, i tried the exe instead because it was an HTC file instead of a contributor. now on MM sense. The 6.xx RUU refused to work no matter what i did, so i OTA'd to the latest version.

fyarf said:
zip was from the same thread, i tried the exe instead because it was an HTC file instead of a contributor. now on MM sense. The 6.xx RUU refused to work no matter what i did, so i OTA'd to the latest version.
Click to expand...
Click to collapse
I seem to be having an entirely different problem. After swapping cables, phones and laptop ports as well as updating drivers, it appears that the usb port of my M8 is broken. I'll have to see at someone else's computer, maybe tomorrow. Pretty frustrating right now as I'm liking the M8 better than my M9 and M7.
[EDIT]
I could stabilize the connection enough to run another, international RUU. The RUU worked fine while the 6.12.1540.4 kept getting stuck at either "checking header" or "sending" - both times with a successfully established connection. I already tweeted HTC asking to have that RUU checked. I assume your findings were correctly indicating a bad RUU, since a.) It also didn't work here and b.) people from my team have confirmed seeing several fail scenarios with that RUU spread over XDA.
Guess that's that then. Thanks for raising the issue. I would have messed around with it much longer otherwise since the error messages are not clearly pointing towards a broken RUU.
[EDIT]
More updates: searching the M8 forum for 6.12.1540.4 turned up this: http://forum.xda-developers.com/showthread.php?p=64320571
That'd mean the RUU fails at the hboot pre-update reboot. All that's needed apparently is to flash only the hboot manually first, so it can proceed. Hence also error 155 which usually indicates issues with the system image. You experienced that most likely because the older hboot couldn't extract the system.img from the rom.zip.
Usually, the procedure is:
RUU updates hboot
RUU reboots to boatloader
RUU updates rest of firmware
RUU sends over the system image in parts
Hboot now decrypts and flashes the part.zips
It just looks like mandatory hboot-first-flash didn't happen right, either not rebooting after it or not flashing it at all.
However, this seems to be fixable by running the hboot/firmware package first and then the complete RUU.

Sneakyghost said:
I seem to be having an entirely different problem. After swapping cables, phones and laptop ports as well as updating drivers, it appears that the usb port of my M8 is broken. I'll have to see at someone else's computer, maybe tomorrow. Pretty frustrating right now as I'm liking the M8 better than my M9 and M7.
[EDIT]
I could stabilize the connection enough to run another, international RUU. The RUU worked fine while the 6.12.1540.4 kept getting stuck at either "checking header" or "sending" - both times with a successfully established connection. I already tweeted HTC asking to have that RUU checked. I assume your findings were correctly indicating a bad RUU, since a.) It also didn't work here and b.) people from my team have confirmed seeing several fail scenarios with that RUU spread over XDA.
Guess that's that then. Thanks for raising the issue. I would have messed around with it much longer otherwise since the error messages are not clearly pointing towards a broken RUU.
[EDIT]
More updates: searching the M8 forum for 6.12.1540.4 turned up this: http://forum.xda-developers.com/showthread.php?p=64320571
That'd mean the RUU fails at the hboot pre-update reboot. All that's needed apparently is to flash only the hboot manually first, so it can proceed. Hence also error 155 which usually indicates issues with the system image. You experienced that most likely because the older hboot couldn't extract the system.img from the rom.zip.
Usually, the procedure is:
RUU updates hboot
RUU reboots to boatloader
RUU updates rest of firmware
RUU sends over the system image in parts
Hboot now decrypts and flashes the part.zips
It just looks like mandatory hboot-first-flash didn't happen right, either not rebooting after it or not flashing it at all.
However, this seems to be fixable by running the hboot/firmware package first and then the complete RUU.
Click to expand...
Click to collapse
I'm not sure about OP, but that worked perfectly for me. I wonder how HTC let a broken RUU.exe past testing?

Double_a2013 said:
I'm not sure about OP, but that worked perfectly for me. I wonder how HTC let a broken RUU.exe past testing?
Click to expand...
Click to collapse
They frequently do. Nothing exciting. That's why I notified HTC. They take their time with fixing them. The earlier the better.

Sneakyghost said:
They frequently do. Nothing exciting. That's why I notified HTC. They take their time with fixing them. The earlier the better.
Click to expand...
Click to collapse
Wow, I didn't realize that. Now if only they'd fix the ATT LTE issues on the dev rom :silly:

Double_a2013 said:
Wow, I didn't realize that. Now if only they'd fix the ATT LTE issues on the dev rom :silly:
Click to expand...
Click to collapse
My ota to the latest dev version got lte on at&t no problem, sure your apn settings are correct?

fyarf said:
My ota to the latest dev version got lte on at&t no problem, sure your apn settings are correct?
Click to expand...
Click to collapse
I've never had to reconfigure them before, regardless of if I'm using GPE or Sense RUUs. I'll give it another shot, and get back in a more timely manner
Edit: Apn settings seem fine. It's using the Nextgenphone one from ATT
Edit #2:
http://forum.xda-developers.com/att...ming-calls-lte-mode-m8-att-arhd-34-0-t3026710
Found this thread about a similar issue. I guess I'll disable HD Voice (Honestly, its borderline useless anyway) and see if that solves anything

Help with installing AT&T Ruu

I'm a very new android user, so please forgive my ignorance.
I'm using a sim unlocked AT&T M8 outside USA with a different carrier. Right now, the bootloader is Locked, CID is 11111111 and S-OFF. I've downloaded the official marshmallow AT&T RUU for m8 from htc website.
I follow the install instructions until the update actually starts. Then it stops after about 10-20 seconds and shows Error 155: unknown error and enters into the recovery steps (in the RUU). My current software number is 4.28.502.2 and im trying to update to RUU_M8_UL_M60_SENSE70_ATT_MR_Cingular_US_6.20.502.5
Can someone please help me out with this? I've been trying for over a week now. I will never receive the OTA's since I'm not using an AT&T sim. So RUU is the only other option left. Thanks a lot in advance.

http://forum.xda-developers.com/showpost.php?p=66886759&postcount=23

ckpv5 said:
http://forum.xda-developers.com/showpost.php?p=66886759&postcount=23
Click to expand...
Click to collapse
Thanks for your reply man, but im extremely lost here. Could you please guide me step by step? I've downloaded the firmware. Where do I put it? I've tried the adb folder. But it show error: can not locate firmware.zip.
Edit: Another question. Is that firmware applicable for my device?

The firmware is applicable BUT since you're using your device outside USA and not on AT&T carrier, S-Off .. the best thing for you to do is fully convert your device to other region, maybe a EU region or Dev Edition .. more suitable for you.
I read somewhere, with the latest firmware you may have calls problem due to Voice HD implemented by AT&T
If you're interested in converting, I will guide you (when I am available)

ckpv5 said:
The firmware is applicable BUT since you're using your device outside USA and not on AT&T carrier, S-Off .. the best thing for you to do is fully convert your device to other region, maybe a EU region or Dev Edition .. more suitable for you.
I read somewhere, with the latest firmware you may have calls problem due to Voice HD implemented by AT&T
If you're interested in converting, I will guide you (when I am available)
Click to expand...
Click to collapse
That would be very kind of you, thanks. Though, i think I've already messed up my phone. I finally got to update with the firmware in the link. The RUU was going on smoothly as well, until it reached 38% when Error 155 showed up again. The phone then went on to the bootloader screen with no options for fastboot, restore or such. I restarted it and entered the bootloader. My firmware is being shown as 6.20.502.5 but when rebooting the phone it won't go past the screen with the HTC logo. I'd be extremely grateful if you could help me out of this mess.
Also, when i open htc sync man, OS number and HTC Sense number shows up as blank, while the firmware number is shown as 6.20.502.5

Big-Bonsai said:
Also, when i open htc sync man, OS number and HTC Sense number shows up as blank, while the firmware number is shown as 6.20.502.5
Click to expand...
Click to collapse
Aren't you supposed to uninstall Htc Sync Manager before you run the RUU ?
That was clearly stated in link that I gave you earlier, and you also need PC with USB 2.0
Uninstall HTC Sync Manager but leave HTC USB drivers then try again to run RUU after you put the device on bootloader/fastboot mode.

ckpv5 said:
Aren't you supposed to uninstall Htc Sync Manager before you run the RUU ?
That was clearly stated in link that I gave you earlier, and you also need PC with USB 2.0
Click to expand...
Click to collapse
Yeah I did. I re-installed it later to see if it would show any information.

Most important is RUU must complete 100%, no error 155
I never use Htc Sync Manager, so I don't know what is shown there.

ckpv5 said:
Most important is RUU must complete 100%, no error 155
I never use Htc Sync Manager, so I don't know what is shown there.
Click to expand...
Click to collapse
So I'm gonna try the RUU again. I'll keep you updated. You've been a big help. Thanks a lot!!

Big-Bonsai said:
I'm a very new android user, so please forgive my ignorance.
I'm using a sim unlocked AT&T M8 outside USA with a different carrier. Right now, the bootloader is Locked, CID is 11111111 and S-OFF. I've downloaded the official marshmallow AT&T RUU for m8 from htc website.
I follow the install instructions until the update actually starts. Then it stops after about 10-20 seconds and shows Error 155: unknown error and enters into the recovery steps (in the RUU). My current software number is 4.28.502.2 and im trying to update to RUU_M8_UL_M60_SENSE70_ATT_MR_Cingular_US_6.20.502.5
Can someone please help me out with this? I've been trying for over a week now. I will never receive the OTA's since I'm not using an AT&T sim. So RUU is the only other option left. Thanks a lot in advance.
Click to expand...
Click to collapse
I don't know if it's the problem,but did you try the RUU after unlocking your bootloader as you are S-OFF?
I think it's supposed to be unlocked if you have S-OFF.
Edit:Just got to know that S-OFF devices have nothing to do with unlocked or locked bootloader.
Why don't you try a EU RUU?Mine was also a AT&T device,but I converted it.

Jongla said:
I don't know if it's the problem,but did you try the RUU after unlocking your bootloader as you are S-OFF?
I think it's supposed to be unlocked if you have S-OFF.
Edit:Just got to know that S-OFF devices have nothing to do with unlocked or locked bootloader.
Why don't you try a EU RUU?Mine was also a AT&T device,but I converted it.
Click to expand...
Click to collapse
Hey man, thanks for replying here. I sent you a pm. Could you please check?

ckpv5 said:
Most important is RUU must complete 100%, no error 155
I never use Htc Sync Manager, so I don't know what is shown there.
Click to expand...
Click to collapse
Hello there. I kind of made it work. What I did was take the rom.zip from the ruu file and flash it via htc fastboot special. And it worked well. The only problem I'm facing now is that the boot animations are EXTREMELY slow. But once it's past that, everything seems pretty normal. I wiped the cache from recovery but that didn't help. Do you have any suggestions for me?

Big-Bonsai said:
\The only problem I'm facing now is that the boot animations are EXTREMELY slow. But once it's past that, everything seems pretty normal. I wiped the cache from recovery but that didn't help.
Click to expand...
Click to collapse
Meaning the boot animations are slow every time you boot, or just the first time (its unclear from what you've posted)? First time booting after RUU will be slow, due to cache being setup, etc. And clearing cache will cause that process to repeat when you start up again.
---------- Post added at 09:32 AM ---------- Previous post was at 09:30 AM ----------
Jongla said:
I think it's supposed to be unlocked if you have S-OFF.
Edit:Just got to know that S-OFF devices have nothing to do with unlocked or locked bootloader.
Click to expand...
Click to collapse
Neither of those statements is entirely correct.
With s-off, you can run an RUU with bootloader locked or relocked. Essentially, the check for the bootloader unlocked condition is bypassed with s-off.
But having the bootloader locked still means its locked (even with s-off). Meaning you can't do things like flash custom recovery with bootloader locked (even with s-off).

redpoint73 said:
Meaning the boot animations are slow every time you boot, or just the first time (its unclear from what you've posted)? First time booting after RUU will be slow, due to cache being setup, etc. And clearing cache will cause that process to repeat when you start up again.
Hello there. Thanks for the reply. What I meant was, the boot animations are slow every time I reboot the device.
Things I have already done:
1. Flashed the rom.zip again.
2. Factory reset.
3. Wiped the cache from recovery multiple times.
4. Restarted in all possible ways. Normal restart. Power off, wait 10 minutes and power on again. Pressed the power and volume up button for restarting. Reboot via fastboot.
I'd really appreciate if you could help me out.
Click to expand...
Click to collapse

redpoint73 said:
Meaning the boot animations are slow every time you boot, or just the first time (its unclear from what you've posted)? First time booting after RUU will be slow, due to cache being setup, etc. And clearing cache will cause that process to repeat when you start up again.
---------- Post added at 09:32 AM ---------- Previous post was at 09:30 AM ----------
Neither of those statements is entirely correct.
With s-off, you can run an RUU with bootloader locked or relocked. Essentially, the check for the bootloader unlocked condition is bypassed with s-off.
But having the bootloader locked still means its locked (even with s-off). Meaning you can't do things like flash custom recovery with bootloader locked (even with s-off).
Click to expand...
Click to collapse
Hello there. Thanks for the reply. What I meant was, the boot animations are slow every time I reboot the device.
Things I have already done:
1. Flashed the rom.zip again.
2. Factory reset.
3. Wiped the cache from recovery multiple times.
4. Restarted in all possible ways. Normal restart. Power off, wait 10 minutes and power on again. Pressed the power and volume up button for restarting. Reboot via fastboot.
I'd really appreciate if you could help me out.

Since you've already flashed the RUU again, I don't think there is much else you can do. Maybe its a common issue with the new build?

redpoint73 said:
Since you've already flashed the RUU again, I don't think there is much else you can do. Maybe its a common issue with the new build?
Click to expand...
Click to collapse
Man I searched EVERYWHERE. People dont seem to have any problems like this. What I did find out was that this might happen if the firmware or kernel numbers dont match (or something?). Can you tell me if I did anything wrong?

Big-Bonsai said:
What I did find out was that this might happen if the firmware or kernel numbers dont match (or something?).
Click to expand...
Click to collapse
That only applies to flashing ROMs in custom recovery. WHich is completely different from RUU. RUU re-writes all partitions, including firmware, kernel, ROM, and a bunch of others. So there isn't a possibility of a mismatch; as long as the RUU ran properly. And since you ran the RUU twice, you pretty much eliminated the possibility it didn't install completely.
Some other options you may consider:
1) Unlock the bootloader, flash TWRP custom recovery, flash a different ROM and see if the slow boot issue persists.
2) Change CID and/or MID (which you are free to do since you are s-off) and try another RUU; such as Developer's Edition or Euro.

redpoint73 said:
That only applies to flashing ROMs in custom recovery. WHich is completely different from RUU. RUU re-writes all partitions, including firmware, kernel, ROM, and a bunch of others. So there isn't a possibility of a mismatch; as long as the RUU ran properly. And since you ran the RUU twice, you pretty much eliminated the possibility it didn't install completely.
Some other options you may consider:
1) Unlock the bootloader, flash TWRP custom recovery, flash a different ROM and see if the slow boot issue persists.
2) Change CID and/or MID (which you are free to do since you are s-off) and try another RUU; such as Developer's Edition or Euro.
Click to expand...
Click to collapse
Thank you so much for the reply. I'd like to take your second suggestion. Can you please point me to the right direction? Or guide me through the steps. I don't know if it's asking too much of you. Thanks anyways.

Big-Bonsai said:
Thank you so much for the reply. I'd like to take your second suggestion. Can you please point me to the right direction? Or guide me through the steps.
Click to expand...
Click to collapse
Which version do you want to "convert" to?
Dev Ed is easy, it shares the same model ID (MID) as AT&T, and you already have SuperCID. So all you would need to do is run the MM Dev Ed RUU: http://dl3.htc.com/application/RUU_M8_UL_M60_SENSE70_MR_BrightstarUS_WWE_6.12.1540.4.exe
Euro is a bit more steps, you would need to change to the Euro MID: http://forum.xda-developers.com/showthread.php?t=2708581
Then run Euro MM RUU, noting that relocking bootloader is not needed for you (since you have s-off): http://forum.xda-developers.com/showpost.php?p=64926626&postcount=6

Can you downgrade an update?

I have an s off unlocked phone. Any of you know if its possible to downgrade to an older update? The new us update is affecting my calls and signal so i need to go back.

Just run the old RUU exe and you'll be set.
Sent from my HTC 10 using Tapatalk

effortless said:
Just run the old RUU exe and you'll be set.
Click to expand...
Click to collapse
Depends. If his handset is s-on he can't "just" run the old ruu. With s-on you can't downgrade the bootloader to a lower version.
So it's either doable with s-off or look for the OS via a backup and try to restore that and run it on the new firmware.

Mr Hofs said:
Depends. If his handset is s-on he can't "just" run the old ruu. With s-on you can't downgrade the bootloader to a lower version.
So it's either doable with s-off or look for the OS via a backup and try to restore that and run it on the new firmware.
Click to expand...
Click to collapse
They state they have an s-off unlocked phone in their first sentence.
Sent from my HTC 10 using Tapatalk

I have HTC10 with s-off and trying to revert to stock with ruu and keep getting error message with wrong version.

pocutzz said:
I have HTC10 with s-off and trying to revert to stock with ruu and keep getting error message with wrong version.
Click to expand...
Click to collapse
Please post the error, so we can see it and help.

andybones said:
Please post the error, so we can see it and help.
Click to expand...
Click to collapse
So in the meantime i reflashed twrp and recovery and restored a backup.
But in the conclusion all i want now is to revert to full stock (i have no backup of that). Can i do that with s-off and bootloader re-locked? the reason that i want to do that is to recieve further updates ota. The reason i did all this to my phone was because the 4g was working when it wanted (not only 4g but mobile data in general). Now i'm thinking of reversing to stock, maybe future updates will solve this or to send the phone back for waranty.
So i need to flash stock, can you guide me from this point to achieve that?
My current software is 1.95.401.3, the phone was unlocked but not developer edition.Cid is HTC__34.
Help me what to do next and i will do one by one until i succeed (sry for my bad english)

@pocutzz you need SuperCID. In download mode, connect phone to pc and open a command window on your computer, type out "fastboot oem writecid 11111111" (I advice you copy and paste this but without the quotation marks), and then you will gain SuperCID. With this, you will be able to install any firmware/RUU regardless of CID.
@ OP, if you want to downgrade, since you are S-OFF there is no need to relock bootloader. As long as your have SuperCID you can downgrade to any firmware just like that. Download RUU and run it.

ZeroInfinity said:
@pocutzz you need SuperCID. In download mode, connect phone to pc and open a command window on your computer, type out "fastboot oem writecid 11111111" (I advice you copy and paste this but without the quotation marks), and then you will gain SuperCID. With this, you will be able to install any firmware/RUU regardless of CID.
@ OP, if you want to downgrade, since you are S-OFF there is no need to relock bootloader. As long as your have SuperCID you can downgrade to any firmware just like that. Download RUU and run it.
Click to expand...
Click to collapse
But after i do super cid what version do you recomend to flash? it will be full stock after? i will be able to recieve updates ota?

pocutzz said:
But after i do super cid what version do you recomend to flash? it will be full stock after? i will be able to recieve updates ota?
Click to expand...
Click to collapse
if you RUU you should still be able to receive OTA afterwards but don't count on me for that one as I've never restored back to stock before. You can search for previous HTC 10 RUUs on google, I recommend not going too far back and just going on the update before the 1.95 one (1.90 I think). Not every version has an RUU so if you can't find an RUU you want, try and find an older version.

ZeroInfinity said:
if you RUU you should still be able to receive OTA afterwards but don't count on me for that one as I've never restored back to stock before. You can search for previous HTC 10 RUUs on google, I recommend not going too far back and just going on the update before the 1.95 one (1.90 I think). Not every version has an RUU so if you can't find an RUU you want, try and find an older version.
Click to expand...
Click to collapse
There is one on the htc website like unlocked/developer edition like 1.91 XXXX , think that will be ok?

pocutzz said:
There is one on the htc website like unlocked/developer edition like 1.91 XXXX , think that will be ok?
Click to expand...
Click to collapse
It should be fine, yes. Make sure you have SuperCID and remember that you do not have to relock your bootloader when running the RUU as you are already S-OFF

ZeroInfinity said:
It should be fine, yes. Make sure you have SuperCID and remember that you do not have to relock your bootloader when running the RUU as you are already S-OFF
Click to expand...
Click to collapse
i re-locked before i run sunshine for s-off. i will try to do that in a few minutes

i have done superCID, but before i try to flas the ruu, wanted to ask you, after that what remains? like s-off,root,twrp,custom recovery?
Okey so i did the superCID, in download mode it shows me the 1111111 but on the phone when i run CID Getter still says HTC__034 (that is how it suppose to show?), i copied from here like you said.Downloaded the ruu.exe from htc website,and when it runs it resets my phone to download mode,the bar goes instantly to 100% and the ruu installer says the 155 error,incorect version i think.
What do i do next?
Maybe MID problem?i've read something about it for HTC M8 i have mid 2PS620000. Maybe the ruu.exe on htc website is for US and i need EU?
Later edit: So i put the global variant with .401. in the sd card and it started to flash, i will se what is what...

pocutzz said:
i have done superCID, but before i try to flas the ruu, wanted to ask you, after that what remains? like s-off,root,twrp,custom recovery?
Okey so i did the superCID, in download mode it shows me the 1111111 but on the phone when i run CID Getter still says HTC__034 (that is how it suppose to show?), i copied from here like you said.Downloaded the ruu.exe from htc website,and when it runs it resets my phone to download mode,the bar goes instantly to 100% and the ruu installer says the 155 error,incorect version i think.
What do i do next?
Maybe MID problem?i've read something about it for HTC M8 i have mid 2PS620000. Maybe the ruu.exe on htc website is for US and i need EU?
Later edit: So i put the global variant with .401. in the sd card and it started to flash, i will se what is what...
Click to expand...
Click to collapse
S-OFF will never be wiped, if you have relocked then it will remain relocked state. Everything else is wiped and restored to stock including recovery, system, data, Internal Storage MIGHT BE WIPED I am not so sure.
if it shows SuperCID in download mode it should be fine. All you needed to do to get it was to execute that command line I posted before.

ZeroInfinity said:
S-OFF will never be wiped, if you have relocked then it will remain relocked state. Everything else is wiped and restored to stock including recovery, system, data, Internal Storage MIGHT BE WIPED I am not so sure.
if it shows SuperCID in download mode it should be fine. All you needed to do to get it was to execute that command line I posted before.
Click to expand...
Click to collapse
thank You for the info.i just flashed from sd card the 401 version, an got the updates,think everything is okey,i will write again after all is good. Ty very much

about 3 friends of mine have bricked htc 10 when trying to downgrade the firmware (Sprint, KKDI and unlocked variant all s-off) I want to ask if I can use the image to sdcard method to unbrick ???

HTC M8 Downgrading

Dear XDA developers, professionals and programmers:
Recently I came across a good deal (HTC M8 in mint condition) and bought it. It was running Android 4.4.4 and I was happy with it till I read that it could be updated to Marshmallow. I followed a few links and after some time discovered that it was originally bought from the USA and locked to AT&T even though the installed rom was WWE. Stupidly I downloaded Marshmallow update for AT&T (RUU) from the HTC website and ran the installer. The installer completed successfully and the phone now runs Marshmallow with Sense7.
Since the rom was filled to brim with useless AT&T crap that does not work outside AT&T network I decided to switch to developer WWE rom but the RUU refused to install on the phone (I have S-Off)
After doing a bit more reading I discovered it was because my new rom has a software number 6.20.502.5 while the RUU I would like to install has a software number of 6.12.1540.4
I googled and googled and searched and searched but could not find a single tutorial to explain how I can replace my current rom with the WWE version which has less bloatware and takes it easy on the RAM.
Can someone kindly explain (or redirect me to a link) of how to downgrade HTC M8 from image version 6.20.502.5 to image version 6.12.1540.4 or in layman's terms how to replace AT&T rom with Developer rom? BTW both roms are Marshmallow. I do not wish to install TWRP or CM so if there is a way besides this I'd be grateful. If not then I don't see any other options and I'd still be grateful
Awaiting your generous replies

What you want is not really a "downgrade" per se. While the AT&T version number is "larger" than the Dev Ed (6.20 versus 6.12), that is mostly just because it came later due to AT&T's slowness in approving the software. I don't think there is much (if anything) that is actually "newer" or "updated" in the AT&T stock ROM (versus Dev Ed). It just has (as you know) all the AT&T branding and bloatware crap.
What is keeping you from flashing the Dev Ed RUU 6.12.1540 is that your carrier ID (CID) needs to match the RUU (even with s-off). Therefore, you need to change your CID to that of the Dev Edition (or alternately SuperCID), which is easy since you already have s-off. You will however need root to do this, so either flash TWRP and SuperSU/Magisk to root, or you can run adb shell with run while booted to TWRP. Either way, you will need to install TWRP: https://forum.xda-developers.com/htc-one-m8/general/change-wwe-m8-to-dev-edition-ota-t2826567
No need to change the Model ID (MID) since the AT&T version and Dev Edition have the same MID.
After that, you should be able to run the Dev Ed RUU.

Sorry .. correction. No need root/twrp to change CID, only change MID need these.
Simply reboot to bootloader/fastboot then run command
To Dev Ed CID
fastboot oem writecid BS_US001
To SuperCID
fastboot oem writecid 11111111
Can't remember if this only can be done on unlocked bootloader. If can't, try this command first
fastboot oem rebootRUU
the follow by the above.
If still can't then need a unlocked bootloader to proceed.

ckpv5 said:
Sorry .. correction. No need root/twrp to change CID, only change MID need these.
Click to expand...
Click to collapse
Ah yes, obviously I was mixing up my methods to change CID versus MID.
Thanks for clarifying, yet again.

Thank you
Many thanks to you gentlemen for your generous assistance and helpful instructions. I really appreciate it. All the best

Update
Good day all:
Sorry to bother again but it failed again! I downloaded fastboot adb and followed the procedure, put the phone in fastboot mode and the CID was already 11111111 and still it refused to accept the RUU. Please find attached a photo of my fastboot screen, hope it can help determine where the problem is on my phone. [ The following errors occurred with your submission:
To prevent spam on the XDA forums, ALL new users prevented from posting outside links in their messages. After approximately 10 posts, you will be able to post outside links. Thank you for understanding!] Site refused to allow me to attach the photo link so I'll just write everything here
*****Software Status - Official******
******LOCKED******** (Even though I can use a non AT&T sim normally)
MS_UL_CA PVT SHIP S-OFF
CID~11111111
HBOOT - 3.19.0.0000
Radio - [email protected](long number)
OPENDSP - v56.2.2. (loooooooong number)
OS-6.20.502.5
eMMC Boot - 2048MB
*end of pic*
On the official HTC site in the support section where they post the RUUs it states the following.
"Before you proceed, please confirm that this software upgrade to 6.12.1540.4 is a newer version than what is currently loaded on your device. If it is the same version, there is no need to reload the software. Navigate to the Home screen then tap All apps > Settings > About and locate the Software information . If your Software number is less than 6.12.1540.4 , you should proceed with the upgrade." end of quote
This paragraph is what let me to believe it is the software version that is stopping me from changing RUUs and why I called this post a downgrade (even though I know it's not)
Can any of you good gentlemen help me out a bit more? I'm willing to answer any questions to further clear the picture of my predicament.
Thank you again

Bootloader is fine, still ATT.
Explain more on the error that you have when you tried installing RUU.
Do note - to run RUU you need PC with USB 2.0;
Latest htc usb drivers which you'll get when you installed latesr htc sync manager (uninstall sync manager but leave all drivers to proceed RUU installation)

ckpv5 said:
Bootloader is fine, still ATT.
Explain more on the error that you have when you tried installing RUU.
Do note - to run RUU you need PC with USB 2.0;
Latest htc usb drivers which you'll get when you installed latesr htc sync manager (uninstall sync manager but leave all drivers to proceed RUU installation)
Click to expand...
Click to collapse
Thank you for your reply:
the RUU I'm trying to install is the developer RUU that I downloaded off the HTC official website. It is the same website I downloaded the AT&T RUU from which installed fine, upgrading the phone's OS from Android 4.4.4 to Android 6.0.
I have several laptops each running a different OS (Windows 7 which I use mostly and have been using for this process) Windows 10, Linux and Solaris.
I did download and install HTC Sync but disabled it's auto run when I noticed every time I plug my phone in it pops up. So that's disabled not uninstalled, but it didn't interfere in the RUU installation of the ATT update and it doesn't pop up when I try to install the developer update.
The Error get is as follows:
Upon running the RUU it does all the necessary checks and then asks me if I would like to install the update, I click on "I Agree" and next, then it puts the phone in boot mode (black screen with HTC written in grey) and after it begins the process by popping up a screen that says: Current info about your Android phone: Image Version: 6.20.502.5 select one below and the update button. After I click on it another screen pops up: Verify that you want to update the Rom version from image version 6.20.502.5 to image version 6.12.1540.4 Clicking on Next another windows shows explaining what happens when I click on Next. When I click next it puts the phone in boot mode and begins by Reading header, sending............................................. then it pops another screen that says update failed and I have to click on recovery and press the power button on my phone for 10 seconds to turn it off

Sir Lucifer said:
On the official HTC site in the support section where they post the RUUs it states the following.
"Before you proceed, please confirm that this software upgrade to 6.12.1540.4 is a newer version than what is currently loaded on your device. If it is the same version, there is no need to reload the software. Navigate to the Home screen then tap All apps > Settings > About and locate the Software information . If your Software number is less than 6.12.1540.4 , you should proceed with the upgrade." end of quote
This paragraph is what let me to believe it is the software version that is stopping me from changing RUUs and why I called this post a downgrade (even though I know it's not)
Click to expand...
Click to collapse
You can't really take the "official" HTC info literally, anymore. By having s-off and SuperCID, you are so far off the "official" path, that most of the rules no longer apply.
S-off bypasses version check (flashing older RUUs is allowed). In fact, you can RUU all the way back to Kitkat if you wanted with s-off (not recommended - just making a point).
---------- Post added at 09:56 AM ---------- Previous post was at 09:52 AM ----------
Sir Lucifer said:
The Error get is as follows:
Upon running the RUU it does all the necessary checks and then asks me if I would like to install the update, I click on "I Agree" and next, then it puts the phone in boot mode (black screen with HTC written in grey) and after it begins the process by popping up a screen that says: Current info about your Android phone: Image Version: 6.20.502.5 select one below and the update button. After I click on it another screen pops up: Verify that you want to update the Rom version from image version 6.20.502.5 to image version 6.12.1540.4 Clicking on Next another windows shows explaining what happens when I click on Next. When I click next it puts the phone in boot mode and begins by Reading header, sending............................................. then it pops another screen that says update failed and I have to click on recovery and press the power button on my phone for 10 seconds to turn it off
Click to expand...
Click to collapse
The RUU stalling out while "sending" is a common bug. Did you simply try running the RUU again? A lot of times, it will work on subsequent attempts.
The fact it got that far, means to me that it passed (or bypassed) any version or CID checks. Otherwise, it never would have gotten to the point of "sending". Instead, it would have told you something like "Error 140" with a description of what the problem was, and aborted the install before ever "sending".

redpoint73 said:
You can't really take the "official" HTC info literally, anymore. By having s-off and SuperCID, you are so far off the "official" path, that most of the rules no longer apply.
S-off bypasses version check (flashing older RUUs is allowed). In fact, you can RUU all the way back to Kitkat if you wanted with s-off (not recommended - just making a point).
---------- Post added at 09:56 AM ---------- Previous post was at 09:52 AM ----------
The RUU stalling out while "sending" is a common bug. Did you simply try running the RUU again? A lot of times, it will work on subsequent attempts.
The fact it got that far, means to me that it passed (or bypassed) any version or CID checks. Otherwise, it never would have gotten to the point of "sending". Instead, it would have told you something like "Error 140" with a description of what the problem was, and aborted the install before ever "sending".
Click to expand...
Click to collapse
Have tried it 5 times already, results are the same. I'm downloading the RUU again, maybe my download was corrupt. Will get back to you later with any results. Thank you for your patience and time. Much appreciated

redpoint73 said:
You can't really take the "official" HTC info literally, anymore. By having s-off and SuperCID, you are so far off the "official" path, that most of the rules no longer apply.
S-off bypasses version check (flashing older RUUs is allowed). In fact, you can RUU all the way back to Kitkat if you wanted with s-off (not recommended - just making a point).
---------- Post added at 09:56 AM ---------- Previous post was at 09:52 AM ----------
The RUU stalling out while "sending" is a common bug. Did you simply try running the RUU again? A lot of times, it will work on subsequent attempts.
The fact it got that far, means to me that it passed (or bypassed) any version or CID checks. Otherwise, it never would have gotten to the point of "sending". Instead, it would have told you something like "Error 140" with a description of what the problem was, and aborted the install before ever "sending".
Click to expand...
Click to collapse
Maybe my downloaded RUU is corrupt, I'll download another time and if it gives me the same problem I'll look for another source. I will keep you posted, thank you very much good man.

RUU Broken on HTC's website
Dear all:
After downloading the developer RUU for the second time and trying to install it again (Marshmallow for those of you who have just joined us) off the HTC support site I failed miserably at changing my firmware using that RUU. After a series of searches on the internet and darknet I came across a post on reddit dot com titled M8 marshmallow RUU from HTC is broken and the article was dated last year. Searching further I found a similar post on a Chinese website that stated the same thing. So in conclusion the developer RUU on HTC's site is damaged as confirmed by a few users/developers on both reddit and the Chinese website.
Sorry for wasting all your time gentlemen. I am very grateful (and very lucky) having assistance from good people like yourselves who have taken from their time to help a complete stranger. Much obliged gentlemen. And thank you all again

Cannot be the RUU is broken.
Another way to do this :
1. Install Dev Edition firmware. You can get the fw_6.12.1540.4.zip from - https://forum.xda-developers.com/showpost.php?p=60218734&postcount=5
2. Instead of using RUU exe, you can use RUU zip (rom.zip) to install RUU. I remember long time ago someone had same problem like you. Asked him to use zip format RUU and it was successful.
I believe there is RUU.zip somewhere on XDA. Can't search now as I'm on mobile.
You can get your own RUU.zip which is actually rom.zip yourself. Just run RUU.exe (no need to connect phone). Once it opens the agreement page, go to %temp% thru your search/run windows menu.
It's better to clear your temp directory first so easy to find 2 newly created folder when you run RUU.exe
The rom.zip is inside one of the folder. Copy that to your desktop.
Then follow this on how to install - https://forum.xda-developers.com/showpost.php?p=64926626&postcount=6
There are 3 methods but I prefer the htc_fastboot because easily can see any error if any.
So step 1 firmware & step 2 RUU (rom.zip)

Sir Lucifer said:
Dear all:
After a series of searches on the internet and darknet I came across a post on reddit dot com titled M8 marshmallow RUU from HTC is broken and the article was dated last year. Searching further I found a similar post on a Chinese website that stated the same thing. So in conclusion the developer RUU on HTC's site is damaged as confirmed by a few users/developers on both reddit and the Chinese website.
Click to expand...
Click to collapse
Did those threads specifically mention RUU 6.12.1540.4? If not, then you realize this device has dozens of RUUs for the M8? Most of which have been confirmed many times over to work properly.
My experience, is that 95% of the time, the problem with RUU running is with the PC. Try re-installing HTC drivers, different USB port, turn off USB 3.0. Also try a different USB cable, or if possible another PC.
Downloading the RUU again (as you tried) is not a bad idea. They do sometimes get corrupted while downloading. But if you download another time, and it still fails, the problem is probably not the RUU.
You should also verify your PC has Visual C++ installed, as the RUU exe requires it. The error your are encountering doesn't sound like the C++ problem. But it won't hurt to verify, anyway. Link here, but confirm it's the right install for your Windows version: https://forum.xda-developers.com/showpost.php?p=60021580&postcount=4
Or of course, you can use the RUU.zip method stated by ckpv5, which avoids all the of the above possible pitfalls. You'll need to search for the 6.12.1540.4 zip, as I don't know where it is off hand, either.

Downloaded Again
redpoint73 said:
Did those threads specifically mention RUU 6.12.1540.4? If not, then you realize this device has dozens of RUUs for the M8? Most of which have been confirmed many times over to work properly.
My experience, is that 95% of the time, the problem with RUU running is with the PC. Try re-installing HTC drivers, different USB port, turn off USB 3.0. Also try a different USB cable, or if possible another PC.
Downloading the RUU again (as you tried) is not a bad idea. They do sometimes get corrupted while downloading. But if you download another time, and it still fails, the problem is probably not the RUU.
You should also verify your PC has Visual C++ installed, as the RUU exe requires it. The error your are encountering doesn't sound like the C++ problem. But it won't hurt to verify, anyway. Link here, but confirm it's the right install for your Windows version: https://forum.xda-developers.com/showpost.php?p=60021580&postcount=4
Or of course, you can use the RUU.zip method stated by ckpv5, which avoids all the of the above possible pitfalls. You'll need to search for the 6.12.1540.4 zip, as I don't know where it is off hand, either.
Click to expand...
Click to collapse
I did download the developer RUU again, I also downloaded the Metro PCS RUU which has a software number of 6.20.531.5 and it installed just fine but refused to see the sim card so I reinstalled AT&T
I am an electronics engineer so yes my laptops are always up to date on flash, oracle, C++, Perl, Java, etc

ckpv5 said:
I believe there is RUU.zip somewhere on XDA. Can't search now as I'm on mobile.
Click to expand...
Click to collapse
redpoint73 said:
You'll need to search for the 6.12.1540.4 zip, as I don't know where it is off hand, either.
Click to expand...
Click to collapse
Sir Lucifer said:
I did download the developer RUU again, I also downloaded the Metro PCS RUU which has a software number of 6.20.531.5 and it installed just fine but refused to see the sim card so I reinstalled AT&T
I am an electronics engineer so yes my laptops are always up to date on flash, oracle, C++, Perl, Java, etc
Click to expand...
Click to collapse
I have the RUU.zip
You can download it from here :good:

Sir Lucifer said:
I also downloaded the Metro PCS RUU which has a software number of 6.20.531.5 and it installed just fine but refused to see the sim card so I reinstalled AT&T
Click to expand...
Click to collapse
That is the T-Mobile RUU. MetroPCS merged with T-Mobile, so it's a bit one and the same. But most everyone will call that RUU/version T-Mobile. It will change band support (as flashing any other RUU will). So if it was working before on the AT&T RUU(or Dev ED will support the same bands) I would not mess with random RUUs, unless we suggest them specifically.