Root help to upgrade from -.99 to 2.15 in order to root

[unlockme614]

I like to know if anyone would be able to assist me. I am having a problem. Im trying to root my evo shift but I'm on -0.99 and need to go to 2.15 or 2.16 in order to root. Im been on the web for days looking for a solution.

Help would be greatfully appreciated.