AT&T SIM Unlock after changing to developer edition - One (M9) Q&A, Help & Troubleshooting

I unlocked the bootloader and got S-OFF with Sunshine. I changed the CID and installed the developer RUU, and updated to Marshmallow 6.0. I just received a response for the device unlock request. I was able to unlock it just by having a different SIM. It didn't work on ViperONE ROM so I went back to my developer edition backup.

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[Q]S-off Problem on M8 HK edition (I just want sim unlock)

HI guys
I had succeeded s-off my M8 HK edition few days ago.
I am working on another M8 HK edition but it not work.
It's show fail message below.
The second M8 I got OTA update(1.54.654.9 to 1.54.654.13) and not wipe.
Is this the problem?
Another question is I just want SIM unlock that I can use Taiwan carrier.
I don't mind use stock rom.
Is there any method that I can unlock SIM card without s-off ?
Thanks for help !!!
SIM unlock without s-off is only possible via the carrier.
If you want s-off you can use sunshine !

Is this process workable to from AT&T to DEV version of M8?

So I was browsing the HTC website and came upon this webpage with various ROMs for the HTC m8 and others:
http://www.htc.com/us/support/rom-downloads.html#unlocked
I have an AT&T Unlocked Bootloader and rooted M8 but it's still S-ON.
Can I basically change the CID to the DEV version and then flash this rom/RUU over the M8 to get the developer version?
http://www.htc.com/us/support/htc-one-m8/news/
You need S-OFF to change your CID. So that is your first goal here.
And Sunshine is your only chance to s-off. ?
Thanks Darth,
Did exactly that...sunshine to s-off, changed the cid to supercid and flashed the Dev Edition RUU to get what I wanted. I noticed that you can't use fastboot boot recovery.img with that RUU but I flashed a custom recovery and then back to stock and everything is great now.

Unlock Code dont work on rooted modified ONE M8

I purchased used M8 which is locked to vodafone and is rooted with unlocked bootlaoder S-ON running GPE ROM. I requested unlock code but it dont accept it as keep saying incorrect password even i tried three times. when i contacted the seller who sent me this unlock code he said phone should be in its original factory state in order for this factory unlock code to work.. Is he right? if yes then is it easy to get back in original setting i.e to unroot or relock bootloader ..
any help would be appreciated

USA unlocked rom to UAEunlocked htc 10

Can I install usa official htc 10 unlocked rom on my unlocked htc 10 bought from uae?
Hmm, If you're rooted then yes
- Root either by sunshine or by unlocking the bootloader and flashing TWRP recovery then root..
- Change the CID & MID to match those for US Unlocked
- Flash the latest Android 6 RUU for US Unlocked
- Run the OTA to upgrade to 7 Nougat.
Note that if you used Sunshine then it's better to S-Off the phone also.. doing so will allow you to downgrade in case you didn't like the newer rom.
I'm S-Off and rooted, did not unlock the BL...
Changed the CID & MID, flashed the US Unlocked Android 6, updated using OTA to Nougat the I did a factory reset to keep Nougat as clean as possible & finally rooted with Magisk (SuperSU didn't do it, the phone keeps rebooting in a loop, restoring TWRP backup did not help either)
Xajel said:
Hmm, If you're rooted then yes
- Root either by sunshine or by unlocking the bootloader and flashing TWRP recovery then root..
- Change the CID & MID to match those for US Unlocked
- Flash the latest Android 6 RUU for US Unlocked
- Run the OTA to upgrade to 7 Nougat.
Note that if you used Sunshine then it's better to S-Off the phone also.. doing so will allow you to downgrade in case you didn't like the newer rom.
I'm S-Off and rooted, did not unlock the BL...
Changed the CID & MID, flashed the US Unlocked Android 6, updated using OTA to Nougat the I did a factory reset to keep Nougat as clean as possible & finally rooted with Magisk (SuperSU didn't do it, the phone keeps rebooting in a loop, restoring TWRP backup did not help either)
Click to expand...
Click to collapse
Good advice but a there are a few things that are not accurate:
1- Root only will not let you change CID or MID, you need S-Off for that.
2- To achieve S-Off the most simple method is Sunshine (paid app, $25).
3- S-Off doesn't require to be rooted previously if you're in an old version of Android, the app applies a temporary root to achieve S-Off, once S-Off'd the root is removed.
4- The only case where you will require permanent root is on latest version of Android, check the Sunshine web site to see which is the latest version temp root works on, is very probable Sunshine's temp root will work on a Marshmallow​ phone.
5- There is already a Nougat RUU for US unlocked, no need to run an old RUU and OTA if you can go to the latest version from the start.

Flashing Custom Roms

Hey guys, i am about to buy an M8.
I red something about htc sunshine. What is that ? Does this mean that i have to pay to use custom roms ? Please explain me
For most people, there is no need to use Sunshine to install a custom ROM.
You just need to unlock bootloader thru htcdev.com and install TWRP recovery to install ROM.
You need Sunshine only when you have a Verizon device because you can't unlock it with htcdev.com
You also may need Sunshine if you have a SIM locked to certain carrier device and you need to SIM unlock it to use with other carrier SIM.
If you're buying a unlocked device (International GSM), not necessary at all for Sunshine.

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