Back when i had Evo LTE up until March, i was one of the few who updated and unfortunately got stuck to s-on for a longer period of time
then this came along called DirtyRacun, same team that got s-off using Panda
here is direct link for DirtyRacun, read instructions, make sure u have the right system before trying, so like i said read instructions
http://unlimited.io/jewel.htm
*Edit= I noticed they removed windows 7 and 32bit system requirements and you must have Ubuntu 12.04 (and newer) 32bit
[so basically you have to make a livecd of Ubuntu 12.04 32bit]
here is another option that was under original android development on EVO LTE on xda
[s-Off] Facepalm S-Off for HTC Evo 4g LTE
(but looks harder than dirtyracun)
or better advice move on from this phone since its known for poor radio/signal performance... the new HTC One is awesome or try something new like a S3, S4, or Note 2, all of these are great phones and in my opinion better than my old Evo LTE...,hope this helps