Who doesn’t hate carrier branding of beautiful and powerful devices? Carriers actually cripple the full potentials of the phones/devices and make unnecessary delays in getting software updates. So, if you have a SIM-unlocked AT&T HTC One (or T-Mobile version) outside USA, chances are you are not getting the OS upgrades in time, even not at all. Sure, there are ways to flash the update manually (OTA.zip ir RUU file), but how about turning your phone into the HTC One Developer Edition, which ensures updates directly from HTC and lesser carrier bloats? Moreover, the developer edition is one of the very firsts to get any software updates. There are some extra settings (such as, ability to select GSM/WCDMA/LTE radio) in the developer edition. So lets get our hands dirty and turn our beloved AT&T HTC One into HTC One Developer Edition.
If you have a SIM-unlocked AT&T or T-Mobie HTC One (M7) outside USA, there’s a good chance that you won’t get the OTA updates for your device. You need to update your device in the “dirty” way. I was having serious troubles updating my AT&T HTC One from Android 4.3 (Sense 5.0) to Android 4.4.2 (Sense 5.5). Roaming around XDA Developers forum, I came to compile a solution. Here’s the step-by-step guide: