1. legionnaire2's Avatar
    I have an unlocked but carrier branded AT&T HTC One M9. I've got it up to Marshmallow. While waiting for AT&T to certify and release Nougat, I noticed that the HTC One site has the Nougat Rom for Unlocked HTC One M9s here.

    1. Has anyone applied this to your AT&T branded unlocked M9?
    2. What issues do I need to watch out for?
    3. If I run into an issue, how do I revert to Marshmallow?
    05-07-2017 03:54 PM
  2. foxbat121's Avatar
    What exactly did you unlock? SIM unlocked? If so , you are still salved to AT&T's release. You will have to convert into Developer edition to be able to apply the releases posted by HTC.
    05-08-2017 07:00 AM
  3. legionnaire2's Avatar
    What exactly did you unlock? SIM unlocked? If so , you are still salved to AT&T's release. You will have to convert into Developer edition to be able to apply the releases posted by HTC.
    Correct. The phone is SIM unlocked. Pardon my naivete, but do I follow a procedure like the one outlined here to convert to the Developer edition?

    Presumably this voids any warranty that HTC offers on the device? I just bought this a couple of days ago, and want to understand what I am getting into before going too far down this path.
    05-08-2017 09:49 AM
  4. foxbat121's Avatar
    Of course, warranty will be voided if you flash anything other than AT&T version of the firmware. And the process could also bricked your phone completely. So, do it at your own risk.
    05-08-2017 07:08 PM

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