1. AC Question's Avatar
    Hi,

    I purchased one AT &T HTC One mobile (OS - 4.4.2) a couple of years back and later I unlocked it from outside. When I try to upgrade my OS using AT & T Software upgrade option, I get " No updates available message".
    Kindly let me know how can I force my mobile to upgrade its OS.
    09-27-2016 11:43 AM
  2. jeffhaskins's Avatar
    I think that means that AT&T didn't release an update for it. To answer your question though, unlock the bootloader and flash a custom recovery with Fastboot. (If you haven't already.) Then make a backup of the stock ROM with your custom recovery. Then download a custom OS such as CyanogenMod 13 (Marshmallow) or any of the other ROMs available for you device and install through custom recovery.
    09-27-2016 11:54 AM

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