For those of you who are interested in getting S-OFF your HTC smartphones, you can now use Firewater to do so.
This will work on most HTC smartphones with Qualcomm chip. I was able to use this method to get S-OFF on bunch of my HTC phones including AT&T One X (One XL), HTC Evo 4G LTE, and HTC One M7/M8.
S-OFF on older devices like AT&T One X allows user to flash custom ROMs normally without having to use a computer to flash kernel (boot image) via fastboot.
On newer HTC devices like HTC One M7 or M8, you do NOT NEED S-OFF as custom ROMs will