when the the AT&T variant of the HTC One X launched, we all found out that it came with a locked bootloader, killing any chances for the dev community to cook up custom ROMs and other good stuff such as overclocking and undervolting. Some of you even went farther and started an online petition to voice your unhappiness to AT&T and HTC.
The good news is that XDA user Grankin01 was able to unlock the phone’s bootloader by hex-editing some partition that allowed him to trick HTC-Dev’s unlock tool into thinking that the AT&T One X is Rogers’ HTC One XL.
If you are feeling adventurous, the instructions to achieve the cracking of the bootloader can be found in the XDA Forums (link below). Keep in mind that you have to be rooted, have ADB and a hex editor such as HxD. All of your personal data will be gone once you go on with this process, make sure you back it all up. And most importantly, DroidMatters is not responsible for any damage you may cause to your phone– you’re doing this at your own risk. Good luck!