HTC devices usually come with Security-ON or S-ON, which prevents you from changing the Cellular ID (CID) or Model ID (MID) of your device, flash OTA updates manually and many other things. To put this more simply, if you are the kind of guy who likes to tinker with their phones, you will need Security-OFF or S-OFF. Going S-OFF won’t change anything from the user-perspective, you will still have the stable device you had before and you will get OTAs like before. Also, don’t confuse this with rooting or unlocking your bootloader, those are separate things. For example, my HTC One is S-OFF with locked bootloader and no root. I get official OTAs without any trouble. S-OFF is required when I convert my AT&T HTC One to Google Play Edition or Developer Edition. Follow the following steps to get your device S-OFF.
Although stock android might not be everyone’s favorite, many prefer the uncluttered stock android skin to OEM skins like Sense and TouchWiz. As the stock android is not bogged down by several different (sometimes unnecessary) pre-loaded apps and services, it usually performs better than manufacturer skins. Getting the complete stock android experience was limited to Nexus devices, which were (and still are) pretty hard to get outside USA for a proper price. But since last year, we are seeing the release of Google Play Edition devices, which boasts stock android on spectacular hardware of different OEMs, such as the Galaxy S4 and the HTC One.
For some reason, you might want to downgrade your HTC One from Android 4.4.2 to Android 4.3. For example, I updated my AT&T HTC One to Android 4.4.2 with Sense 6.0 by converting it to Developer Edition. After using it for some days, I wanted to revert it back to stock conditions. You might want to do it before returning it to AT&T for warranty or other issues. If you just try to flash a lower version RUU, you will most likely get error message. The problem results from the fact that higher Android firmware from HTC usually comes with a higher version of HBOOT. So, whenever you try to flash an RU.exe, it will show you error as it cannot flash a lower version HBOOT to a device which already has a higher HBOOT version. We need to manually flash a lower version HBOOT first and then use RUU.exe to return to complete stock.
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: