mobile

Thanks to @Jonny We now have the AT&T RUU
M9_ATT_Cingular_US_1.32.502.9

https://www.androidfilehost.com/?fid=95916177934556955

And thanks To @jcase we now have S-OFF
SunShine S-Off v3.1 for the HTC One M9
http://theroot.ninja/

With S-OFF we can now convert the AT&T phones to Developer Edition
The Developer Edition does not have any of the AT&T Bloatware in it and the phone are the same hardware
all that's needed is a simple CID change and flash the Developer Edition RUU.

You could also convert to International but it will require a MID change that I'll post here ASAP

To convert to Developer Edition, you phone will need to be unlocked at htcdev.com with TWRP 2.8.6.4 Beta Flashed in Download mode (Black bootloader screen) Please read this before flashing TWRP And Rooted with SuperSU Flashed in TWRP.

Once your unlocked and Rooted and S-OFF you can change your CID to the Developer Edition
All fastboot commands will take place in Download Mode / not in the normal white bootloader screen

fastboot oem writecid BS_US001
or
fastboot oem writecid BS_US002

followed by fastboot reboot-bootloader

Both will work for flashing the RUU.

For Super CID use
fastboot oem writecid 11111111
fastboot reboot-bootloader

At this point your ready to backup all your stuff and flash the Developer Edition RUU
I advise you copy the entire internal sdcard of the phone to your PC before flashing the RUU
also use google / and HTC backup to save your phones contacts, app's and SMS, Call history ..etc

Here are the 2 Developer Edition RUU's we have so far (to flash these please rename them to RUU.zip to simplify the commands)

This is the one the phone shipped with
0PJAIMG_HIMA_UL_L50_SENSE70_ATT_NA_Gen_Unlock_1.32 .617.6_R2_Radio_01.01_U11440221_59.04.50303G_2_F_r elease_426167_signed.zip

and this is the Current Software / with Camera, overheating Fix (use this one)
0PJAIMG_HIMA_UL_L50_SENSE70_ATT_NA_Gen_Unlock_1.32 .617.30_Radio_01.01_U11440221_62.05.50320G_F_relea se_427069_signed.zip

If you have problems with the normal fastboot flashing any RUU you'll have to use the htc_fastboot pulled from the RUU.EXE
you can download it here >> https://www.androidfilehost.com/?fid=96039337900114016 >> Thanks go to @Sneakyghost for sharing


htc_fastboot oem rebootRUU
htc_fastboot flash zip RUU.zip
htc_fastboot flash zip RUU.zip <this may not be needed it might restart on it's own>
htc_fastboot reboot

If you need to go back to AT&T software just change your CID back to CWS__001 and Flash the AT&T RUU and you'll be back to Stock
I'll post more later on going back to complete stock.