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OK. I'm a little bit lost in the HTC world!
I've had a Samsung Galaxy Note II for the last year and have just replaced it with the HTC ONE (M8). I found the whole rooting and ROM procedure relatively straight forward with the Note II. In a nutshell you:
1) Rooted with a Windows based application
2) Installed / Flashed a recovery system
3) Flashed a custom ROM using a Windows based application called ODIN
And that was that. Pretty straightforward. Having had a nose around the HTC forum it's awash with clever folk using abbreviations and acronyms like CID, RUU and S-OFF...!
My M8 is on EE network in the UK which I know is CID ORANG001. What I would like though is to convert my M8 to a generic European M8 so I can receive the latest HTC updates rather then await EE to push out their version. This therefore prompts me to ask the following questions:
1) Is this something we will be able to achieve?
2) What is the (potential) process to achieve this (assuming something similar for the M7 already exists)?
2) Will over the air updates work?
I've read numerous posts which seem contradicting. Some talk about a simple change of the CID others mention S-OFF as the GOD of everything related to the subject. If I were to guess, changing the CID seems too simple, but I'm guessing once changed to a generic EU CID it's possible to receive HTC's OTA updates? Or am I wrong there? Or having another guess I would assume I'd need to go down the lines similar to Samsung process of rooting or S-OFF (security off?) and flashing a generic stock EU ROM?
So what CAN currently be achieved and what CAN'T currently be achieved?
I guess I could do with a little background on these processes and the terminology used.
Any help, greatly appreciated.
Can :
Unlock the bootloader and flash a custom recovery to install a custom rom based on the latest firmware. You are depending on rom updates from the dev if he updates it to the latest software/firmware
Can't :
S-off
Change cid
Get ota via another rom
Run a ruu because they are simply not available
So to receive ota you need your original stock rom. And before you start messing around please make a stock nandroid backup and store it !
http://forum.xda-developers.com/showthread.php?t=2701376
Chris_c81 said:
OK. I'm a little bit lost in the HTC world!
I've had a Samsung Galaxy Note II for the last year and have just replaced it with the HTC ONE (M8). I found the whole rooting and ROM procedure relatively straight forward with the Note II. In a nutshell you:
1) Rooted with a Windows based application
2) Installed / Flashed a recovery system
3) Flashed a custom ROM using a Windows based application called ODIN
And that was that. Pretty straightforward. Having had a nose around the HTC forum it's awash with clever folk using abbreviations and acronyms like CID, RUU and S-OFF...!
My M8 is on EE network in the UK which I know is CID ORANG001. What I would like though is to convert my M8 to a generic European M8 so I can receive the latest HTC updates rather then await EE to push out their version. This therefore prompts me to ask the following questions:
1) Is this something we will be able to achieve?
2) What is the (potential) process to achieve this (assuming something similar for the M7 already exists)?
2) Will over the air updates work?
I've read numerous posts which seem contradicting. Some talk about a simple change of the CID others mention S-OFF as the GOD of everything related to the subject. If I were to guess, changing the CID seems too simple, but I'm guessing once changed to a generic EU CID it's possible to receive HTC's OTA updates? Or am I wrong there? Or having another guess I would assume I'd need to go down the lines similar to Samsung process of rooting or S-OFF (security off?) and flashing a generic stock EU ROM?
So what CAN currently be achieved and what CAN'T currently be achieved?
I guess I could do with a little background on these processes and the terminology used.
Any help, greatly appreciated.
Click to expand...
Click to collapse
Also not familiar anymore with HTC. After reading and reading and still not finding the exact answers to my questions, so I simply (after unlocking and flash TWRP recovery and backing up) tried to flash Virtuous ROM (1.54.401.5) over my German o2 device (1.12.206.17, CID O2___001). Everything worked except WiFi, so I tried a last call with mikes ARHD Rom 3.1, before going back to stock. And this ROM works brilliantly!
But I would also be happy if the OP questions could be answered...
@Mr Hofs
1. the WiFi problem discribed above could be firmware related?
2. When my Provider o2 brings out an update with firmware, can I simply relock bootloader and push the (perhaps) available firmware.zip it to the device via fastboot like mike explains in his firmware thread?
Edit :
Well that would be weird as both roms the OP flashed are based on 1.54.401 so i would say no.....
Mr Hofs said:
Can :
Unlock the bootloader and flash a custom recovery to install a custom rom based on the latest firmware. You are depending on rom updates from the dev if he updates it to the latest software/firmware
Can't :
S-off
Change cid
Get ota via another rom
Run a ruu because they are simply not available
So to receive ota you need your original stock rom. And before you start messing around please make a stock nandroid backup and store it !
http://forum.xda-developers.com/showthread.php?t=2701376
Click to expand...
Click to collapse
OK thanks. Few more questions if I may.
So from the "can't" list, IF we can get the ability to change CID and have S-OFF in the future, would it provide the ability to receive OTA updates when HTC push them out, or are OTA updates simply out of the game entirely?
Sent from my HTC One_M8 using Tapatalk
Yes that should be possible , all you need then is
Changed cid
Stock rom
Stock kernel
Stock recovery
Or the ruu (if available)
Then the phone is ready for ota updates.
Mr Hofs said:
Yes that should be possible , all you need then is
Changed cid
Stock rom
Stock kernel
Stock recovery
Or the ruu (if available)
Then the phone is ready for ota updates.
Click to expand...
Click to collapse
Great thanks. Last question then, what is RUU?
I'll keep your thread bookmarked and attempt to get a backup in there.
Sent from my HTC One_M8 using Tapatalk
A ruu is a Rom Update Utility and it contains the rom, kernel, firmware, recovery (and some more stuff). When a ruu is installed its like the phone is factory stock.
Mr Hofs said:
A ruu is a Rom Update Utility and it contains the rom, kernel, firmware, recovery (and some more stuff). When a ruu is installed its like the phone is factory stock.
Click to expand...
Click to collapse
OK brilliant thanks. Really appreciate your help.
Sent from my HTC One_M8 using Tapatalk
Hi there.
So In short I'm a Nexus 5 user and as you can imagine unlocking that phone is literally 2 minutes at most using fastboot.
I got myself a brand spanking new HTC One m8 on Vodafone UK, however I hate Sense UI and would love to "transform" my phone to GPE edition.
I have few questions hopefully easy to answer. reading through the forums gives me a headache.
1. Do I need a S-Off if I want to convert my GSM to GPE? Thought its just a matter of flashing a rom? (I do know the answer to this but just cant believe it)
2. My phone is network locked, should I unlock it first and than run sunshine or the other way around (I've heard people having problems when they try to unlock after sunshine)
3. Do I need to backup my stock Vodafone Image if I want to return to stock at some point? I had HTC Desire/HD and returning back to stock was matter of flashing RUU back in the days (these seem to be provided on HTCDev now). But it looks like a lot has changed since then.
4. What order of operations? Please correct me if I'm wrong: Unlock Bootloader (Any other way than HTC Dev?) --> TWRP-->Root-->Sunshine-->Backup Image-->Convert to GPE
I'm absolutely fine with using fastboot etc (no toolkits for the wicked ) although most guides involve Windows and im on Mac... Anyone had any issues ?
Appreciate any help
Thanks
Nexus phones are designed to be developer phones, so they make it as easy as possible. (Though, and this is an important note, they still keep secure boot enabled...) The HTC One, like most consumer oriented devices, isn't quite the same.
First off, yes, you will need to S-off your phone to do a complete version change. You will also need to change your CID/MID if you want OTA updates. None of this has anything to do with SIM locking, though there is a thread you might consult once you are S-off. It may or may not work with HBOOT 3.19, but once you are S-off, you can downgrade to an older HBOOT that does fully support SIM unlocking.
If you want to ever go back, you will also need to install TWRP or CWM like always and make a nandroid backup. You don't have to be S-off to do this, but Sunshine unlocks your bootloader in the process, which you WILL need to do.
If your device is supported (because some newer firmware versions aren't) I would suggest using Sunshine S-off to unlock your bootloader and S-off your phone. At that point, flash over a custom recovery and backup your current install. Then, use the instructions here to switch your CID/MID and install the appropriate GPE version. Note! You *CAN* use a GPE RUU, but that will change the partitioning on the device making it very hard to go back.. I would strongly recommending using using a GPE backup and leaving the partition tables alone, but that's just me.
jshamlet said:
Nexus phones are designed to be developer phones, so they make it as easy as possible. (Though, and this is an important note, they still keep secure boot enabled...) The HTC One, like most consumer oriented devices, isn't quite the same.
First off, yes, you will need to S-off your phone to do a complete version change. You will also need to change your CID/MID if you want OTA updates. None of this has anything to do with SIM locking, though there is a thread you might consult once you are S-off. It may or may not work with HBOOT 3.19, but once you are S-off, you can downgrade to an older HBOOT that does fully support SIM unlocking.
If you want to ever go back, you will also need to install TWRP or CWM like always and make a nandroid backup. You don't have to be S-off to do this, but Sunshine unlocks your bootloader in the process, which you WILL need to do.
If your device is supported (because some newer firmware versions aren't) I would suggest using Sunshine S-off to unlock your bootloader and S-off your phone. At that point, flash over a custom recovery and backup your current install. Then, use the instructions here to switch your CID/MID and install the appropriate GPE version. Note! You *CAN* use a GPE RUU, but that will change the partitioning on the device making it very hard to go back.. I would strongly recommending using using a GPE backup and leaving the partition tables alone, but that's just me.
Click to expand...
Click to collapse
Thanks a lot for that.
Could your please clarify your last 2 sentences. This is first I hear about. If I use GPE backup will I be able to get OTA updates? Where can I find GPE backup rather than RUU. I think most here are RUU's.
Or do you mean GPE ROM vs GPE RUU?
MattSkeet said:
Thanks a lot for that.
Could your please clarify your last 2 sentences. This is first I hear about. If I use GPE backup will I be able to get OTA updates? Where can I find GPE backup rather than RUU. I think most here are RUU's.
Click to expand...
Click to collapse
The partition sizes are different between GPE and Sense, with Sense having a much larger /system partition than GPE. If you convert from Sense to GPE fully (using an RUU), then you will have to use an RUU to go back to Sense or the /system partition won't be large enough. If you just restore a nandroid backup of GPE to a Sense partitioned device, it will still work fine and you can revert back without any special effort.
S-off yes carrier unlocking yes and I'm an ex nexus 5 user as well
Sent from my HTC One_M8 using XDA Free mobile app
MattSkeet said:
3. Do I need to backup my stock Vodafone Image if I want to return to stock at some point? I had HTC Desire/HD and returning back to stock was matter of flashing RUU back in the days (these seem to be provided on HTCDev now). But it looks like a lot has changed since then.
Click to expand...
Click to collapse
I don't believe HTC posts RUUs to HTCDev.com any longer. There is a RUU floating around for the "generic" WWE version, but for Vodaphone or other carrier branded versions outside the US, you probably won't find any RUUs.
Therefore, its always good to at least make a nandroid before making any other changes. Or you can find the stock nandroid for your CID here:
http://forum.xda-developers.com/showthread.php?t=2701376
MattSkeet said:
4. What order of operations? Please correct me if I'm wrong: Unlock Bootloader (Any other way than HTC Dev?) --> TWRP-->Root-->Sunshine-->Backup Image-->Convert to GPE
Click to expand...
Click to collapse
I believe you can temp root, sunshine s-off and use sunshine to unlock the bootloader and bypass HTCDev.com. But I haven't done it that way personally, so I'm not 100% on that.
redpoint73 said:
I don't believe HTC posts RUUs to HTCDev.com any longer. There is a RUU floating around for the "generic" WWE version, but for Vodaphone or other carrier branded versions outside the US, you probably won't find any RUUs.
Therefore, its always good to at least make a nandroid before making any other changes. Or you can find the stock nandroid for your CID here:
http://forum.xda-developers.com/showthread.php?t=2701376
I believe you can temp root, sunshine s-off and use sunshine to unlock the bootloader and bypass HTCDev.com. But I haven't done it that way personally, so I'm not 100% on that.
Click to expand...
Click to collapse
http://www.htcdev.com/devcenter/downloads/P00 there are RUU's here which is very strange and makes it confusing in regards to backing everything up if its there
MattSkeet said:
http://www.htcdev.com/devcenter/downloads/P00 there are RUU's here which is very strange and makes it confusing in regards to backing everything up if its there
Click to expand...
Click to collapse
The only RUU there is T-Mobile US. All the rest are kernel source (and a couple framework support) files. Keep in mind, the RUU is something like 1.6 GB.
Note that there are other RUUs, they just aren't posted there. The Developer Edition has an RUU, and there is an older one for AT&T floating around somewhere as well.
I really don't understand why HTC doesn't make these more available, as they are a great way to reset a phone short of warranty service. I would think they would want people to have these as an option.
jshamlet said:
Note that there are other RUUs, they just aren't posted there. The Developer Edition has an RUU, and there is an older one for AT&T floating around somewhere as well.
Click to expand...
Click to collapse
Yes, in fact AT&T has RUUs for every major OTA build its released so far. Sprint and T-Mobile US also have RUUs. Of the major US carriers, only Verizon does not have RUUs.
I haven't seen any official RUU releases outside the US. I know there is a WWE 3.28.401 RUU think is being linked lately, but I don't know if that is a leak, or something more official. But otherwise, RUUs don't exist outside the US (or only as leaks). What makes the US so special, I don't know.
jshamlet said:
I really don't understand why HTC doesn't make these more available, as they are a great way to reset a phone short of warranty service. I would think they would want people to have these as an option.
Click to expand...
Click to collapse
I don't get it either. On past devices, I've seen specific reports of HTC support directing folks to RUU when they have software issues (after the "usual" solutions like factory reset didn't help).
Hello this is my first HTC device and I just learnt about Hboot, Firewater, S-off, and RUU terms.
These are my AT&T HTC M8 with 4.4.2 OS on it, Just had it S-off and Unlocked bootloader.
Can I know the following things...before flashing anything onto this
1-> Can I SIM unlock it using the Config.dat method as the device was not at all updated ?
2-> Changing CID to SuperCID grants me access to all RUUs but that's not needed as I will use customROMs based on Sense and AOSP right ?
3-> In order to flash and all I must be S-off I did it So now I can use ViperROM 4.4.4 but before that the viperrom page says need for an updated firmware >3 mines on 1.5, So if I flash any will the S-off goes away ?? & found this thread here for firmware updates but it says red text, can I know whats that ??
4-> How can I convert this device to a fully unlocked device like dev edition/ international version ?
5-> Most important of all what makes this device go hardbrick and S-on again (Firmware flashing, RUU etc, Like to know what will cause this since the device is S-off can I assume this device won't brick like Nexus phones).
Sorry for this lengthy post, never used a HTC device wanted to make sure all is well.
Thanks :fingers-crossed: !!
S-OFF allows you to do all sorts
I used the Sim unlock method after i S-OFF my At&t device just because and really couldn't tell you if worked cause I actually like At&t .
Supercid does allow for flashing other gsm firmware/ruu
Yes you would want to be as close in firmware to gain the best running experience when flashing Roms above your current firmware
S-OFF only changes if you do it the way you gained it
Being S-OFF you could flash the wrong ruu and hard brick your device ( CDMA device hardware I believe could brick your device along with the wrong device kernel could also brick it )
Nexus is pretty solid but can be bricked
Thanks for the quick post :good:
So I will go ahead and update the firmware w.o redtext (just noticed it's the one that says "This build blah blah" when bootup) then I'm good to go for the flashing all stuff ??
I can also flash a non sense based rom after using sense based Viper ROM / ARHD / etc without any issues, now is my device basically a Dev Edition plus the RUU & CID editing is only needed If I ever need going back to stock (though it wont happen) or flash regional firmwares or converting to GPE, DEV, WWE editions rt ?
Lastly my device ID it says M8_UL_CA will it change after I flash a ROM or Radio or Firmware ?
Ashtrix said:
Thanks for the quick post :good:
So I will go ahead and update the firmware w.o redtext (just noticed it's the one that says "This build blah blah" when bootup) then I'm good to go for the flashing all stuff ??
I can also flash a non sense based rom after using sense based Viper ROM / ARHD / etc without any issues, now is my device basically a Dev Edition plus the RUU & CID editing is only needed If I ever need going back to stock (though it wont happen) or flash regional firmwares or converting to GPE, DEV, WWE editions rt ?
Lastly my device ID it says M8_UL_CA will it change after I flash a ROM or Radio or Firmware ?
Click to expand...
Click to collapse
Yes, you can flash any ROM. If you plan on running GPE, you will need to convert back using a WWE RUU as GPE uses different sized partitions making the system partition too small to run Sense based ROMs.
Your device ID will change to M8_UL after flashing WWE firmware, but it isn't anything to worry about.
xunholyx said:
Yes, you can flash any ROM. If you plan on running GPE, you will need to convert back using a WWE RUU as GPE uses different sized partitions making the system partition too small to run Sense based ROMs.
Your device ID will change to M8_UL after flashing WWE firmware, but it isn't anything to worry about.
Click to expand...
Click to collapse
Thanks a lot !!
While GPE is a trade off for only AOSP, with DEV/WWE I can run any ROM based on Sense/AOSP i.e GPE & including the Lollipop right ?
So before proceeding I will update the Firmware first to a 2.xx or 3.xx then run an RUU based on DEV/WWE for conversion
Sorry for so many doubts, slowly learning about HTCs devices
Ashtrix said:
Thanks a lot !!
While GPE is a trade off for only AOSP, with DEV/WWE I can run any ROM correct ?
So before proceeding I will update the Firmware first then run an RUU based on DEV/WWE for conversion & for the last If I need to run Lollipop I should flash firmware again for v5 base or the WWE/DEV RUU (I think the Dev edition had got the lollipop Update) has the Firmware, Radio packed with it ?
Click to expand...
Click to collapse
The RUU contains the firmware. No need to flash it twice. You could just flash the WWE firmware if you are on Sense right now. Mostly RUUs are used to fix devices that are experiencing issues, or for converting GPE/Sense.
Running the RUU wipes EVERYTHING, so flashing the firmware is preferable. The WWE 5.0.1 firmware should be out soon, but DevEd is out now. If you wanted to convert to DevEd, there are plenty of tutorials on XDA. I'm really not up to speed on running DevEd firmware.
Found this page for all stuff & this thread for conversion.
& what's this .401 stuff in the first thread ?
I'm ok with full wipe anyways so I can use the RUU or the other recovery way for the conversion right ?
Ashtrix said:
Found this page for all stuff & this thread for conversion.
& what's this .401 stuff in the first thread ?
I'm ok with full wipe anyways so I can use the RUU or the other recovery way for the conversion right ?
Click to expand...
Click to collapse
401 is International WWE firmware. For example, my firmware version is 3.28.401.9 Verizon's latest firmware is 3.28.605.4
If you are okay with the full wipe, the RUU is probably the best way to convert, but the recovery method with stock recovery and stock nandroid would work too.
xunholyx said:
401 is International WWE firmware. For example, my firmware version is 3.28.401.9 Verizon's latest firmware is 3.28.605.4
If you are okay with the full wipe, the RUU is probably the best way to convert, but the recovery method with stock recovery and stock nandroid would work too.
Click to expand...
Click to collapse
Thank you verymuch for clarification !!!
Will do the work tmrw, its 2AM here
I've been fully converted GPE and back twice and after successfully converting back to Sense this last time I chose the Dev edition backup and stock recovery method followed by the proper CID&MID to take the OTA update witch is now lollipop
So basically I now have a lollipop firmware to run with the stock GPE lollipop ROM and you bet it runs great
Hi there all,
Have previously done some modding on older HTCs, but have not really done it in a while.
By chance and opportunity, I got my hands on an M9. Love it, but it is Telstra (AU) branded. I know that to get the lastest FW (OEM or otherwise), its best to get off carrier branded FW.
In order to do this (aim to get to intl or Asia unbranded generic FW), I should:
1. S-Off (via HTC Dev).
2. Install custom recovery
3. do a back up (Just in case)
4. Load the generic RUU of my choosing
5. (optional) install the stock recovery that matches the RUU (for OTA updates)
Is this right? Do I need to mess with CID?
Any info to help me refresh myself would be great.
Apparently HTC dev does not assist with S-OFF.. maybe www.theroot.ninja though ..
jauhien said:
Apparently HTC dev does not assist with S-OFF.. maybe www.theroot.ninja though ..
Click to expand...
Click to collapse
oh good old sunshine.
Anyone have anything else to add? any tips to make it easier on the m9?
Just that installing a RUU will install stock recovery anyway.
The root ninja guys are in the US and get their M9s in a few weeks, you won't be able to achieve the above until s-off is available, you will need to supercid the device to enable you to flash a none telestra RUU.
A custom ROM may well be an option once they start popping up ?
Thanks Punk/Lee, good insight.
Yeah, I've used Viper ROM ages ago with my M7 i think, and that went well, so may go down custom as well. Cant wait to start mucking around with my M9.
Bootloader unlock reportedly works if you select "other" on HTC dev., also, the process must be done from Recovery Download mode, i. e. Hboot-->Downloadoad mode. At least that's the method I have seen reported successful.
My name is Harold and I'm a flashaholic.....
thanks Harold. I will try it when I get some time this week
Excuse the noobness.
As per above, if I can unlock the bootloader using the "Other" selection on HTC Dev, plus this toolkit is available : http://forum.xda-developers.com/one-m9/development/tool-windroid-universal-android-toolkit-t3066989
Then, flash one of the following RUUs - http://forum.xda-developers.com/one-m9/general/htc-one-m9-dump-t3060545
Effectively, that means I can unbrand (use one of the stock RUUs), and it would receive the relevant updates from those regions, yes?
sephstyler said:
Excuse the noobness.
As per above, if I can unlock the bootloader using the "Other" selection on HTC Dev, plus this toolkit is available : http://forum.xda-developers.com/one-m9/development/tool-windroid-universal-android-toolkit-t3066989
Then, flash one of the following RUUs - http://forum.xda-developers.com/one-m9/general/htc-one-m9-dump-t3060545
Effectively, that means I can unbrand (use one of the stock RUUs), and it would receive the relevant updates from those regions, yes?
Click to expand...
Click to collapse
If that RUU, what you want to flash, has different CID/MID - flashing will fail..
And on the other hand for editing your CID/MID in order to match those in RUU can't be accomplished without S-OFF - which you should not confuse with "unlocking bootloader"..
hey, I managed to debrand my M9. I followed these steps:
1. unlock bootloader
2. flash recovery and root
3. S-Off with sunshine
4. Change my CID to HTC__001
5. Put the 0PJAIMG.zip on an SD card and rebooted into bootloader mode and it de-branded the phone
Hi everyone!
I've been far from Rom changing, etc for a period. I've done this with HTC Desire HD and Samsung S4, but these two are very simpler than M8. Now I wnat to do this with my M8. These are my phone's details:
HTC One M8x
Android 5.0.2
Build number 4.24.709.2
I want to Root, S-OFF, Install a new Recovery (The best in your opinion). Also I don't think about restore it once again to factory defaults as Custom Roms (Like Android Revolution, Venom Viper, etc) update too! These are my questions:
1. Can I Root and S-OFF Android 5?! Is there any problem with this?
2. What Recovery do you suggest for me?
3. May you give me a link for this? I've searched a lot, but I can't find it, There is no straight way!
4. What is SuperCID?! Should I do this?! How?
5. As you see my phone's build number shows it's not Europe version. It's for Korea I think. How can I find original Rom if there's a problem?
Sorry if I'm wrong by making a thread for this questions.
Finally, Thank you very very much!
M8x is the Taiwan variant. Its identical to other "GSM" M8 versions in hardware, but its CPU is clocked higher.
Most mods for the other "GSM" versions will work (root, custom ROMs, and many more). However it has been found some things are not cross-compatible, such as firmware (in particular radio) from other M8 versions will not work on the M8x.
salah_erosennin said:
1. Can I Root and S-OFF Android 5?! Is there any problem with this?
2. What Recovery do you suggest for me?
3. May you give me a link for this? I've searched a lot, but I can't find it, There is no straight way!
4. What is SuperCID?! Should I do this?! How?
5. As you see my phone's build number shows it's not Europe version. It's for Korea I think. How can I find original Rom if there's a problem?
Click to expand...
Click to collapse
1) Unlock the bootloader, and root should be fine.
You should be able to s-off by sunshine. The sunshine app will check first to see if your phone is compatible, and you won't be charged ($25) if your version is not compatible. So no harm in checking first. But according to the following thread, sunshine should work (see near the end of thread): http://forum.xda-developers.com/showthread.php?t=2738509
Although it should be noted that s-off is not strictly needed for root, custom ROMs, and many other things. And the usefulness of s-off is likely limited for your version, anyway; as some of the main reasons for s-off would be to flash another versions radio or other firmware (and as mentioned previously, this won't work for the M8x).
2) TWRP is the only currently updated custom recovery for this device. Use version 2.8.4 or later based on the thread linked it Item 1 above. Older versions are likely to cause issues.
3) Here you go: https://twrp.me/devices/htconem8gsm.html
4) SuperCID will "pass" any CID check for HTC software updates or other "official" HTC files. But seeing as the main reason for changing the CID would be to install another versions firmware or RUU (and as previously discussed, this won't work on your M8x), I would say you don't need it.
Once the phone is s-off, you can make the phone SuperCID with a single fastboot command.
5) Not Korean, as mentioned the M8x is from Taiwan. I can't find the stock nandroid for your version. But after you unlock the bootloader, you backup the stock recovery and stock ROM with TWRP.
redpoint73 said:
M8x is the Taiwan variant. Its identical to other "GSM" M8 versions in hardware, but its CPU is clocked higher.
Most mods for the other "GSM" versions will work (root, custom ROMs, and many more). However it has been found some things are not cross-compatible, such as firmware (in particular radio) from other M8 versions will not work on the M8x.
1) Unlock the bootloader, and root should be fine.
You should be able to s-off by sunshine. The sunshine app will check first to see if your phone is compatible, and you won't be charged ($25) if your version is not compatible. So no harm in checking first. But according to the following thread, sunshine should work (see near the end of thread): http://forum.xda-developers.com/showthread.php?t=2738509
Although it should be noted that s-off is not strictly needed for root, custom ROMs, and many other things. And the usefulness of s-off is likely limited for your version, anyway; as some of the main reasons for s-off would be to flash another versions radio or other firmware (and as mentioned previously, this won't work for the M8x).
2) TWRP is the only currently updated custom recovery for this device. Use version 2.8.4 or later based on the thread linked it Item 1 above. Older versions are likely to cause issues.
3) Here you go: https://twrp.me/devices/htconem8gsm.html
4) SuperCID will "pass" any CID check for HTC software updates or other "official" HTC files. But seeing as the main reason for changing the CID would be to install another versions firmware or RUU (and as previously discussed, this won't work on your M8x), I would say you don't need it.
Once the phone is s-off, you can make the phone SuperCID with a single fastboot command.
5) Not Korean, as mentioned the M8x is from Taiwan. I can't find the stock nandroid for your version. But after you unlock the bootloader, you backup the stock recovery and stock ROM with TWRP.
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Thank you very very much for your help. That's a complete guide.