Help with unrooting, seriously I am going insane here

[Matthew Bosley]

I bought a evo 4g from someone and didn't know it was rooted till I tried to activate it, well I have been at this all day and cant unroot this damn thing. As of right now it is sitting at a soft brick "white htc evo 4g" screen. I have tried many different RUUs and have also put zip RUUs on my sd card and ran it through the hboot. When I did RUUs through desktop I get error 140 and when done with phone with pc36img it says main version is bad and fails. I don't know anything about this, I just want this phone back to normal, I am willing to tip someone for one on one help. Heres my hboot info
RELOCKED
supersonic evt 2-3 SHIP S-ON
HBOOT-2.18.0001
Microp-041F
Radio-2.15.00.12.19


From my research I think I have to downgrade my hboot? Keep in mind I need layperson terms, will greatly appreciate any help.