If you've never gone S-Off and changed the H-Boot...
http://androidforums.com/evo-v-4g-a...evo-v-4g-ruu-flashing-guide-unroot-guide.html
Try this. Revert to stock with the RUU...lock the bootloader again...and see if you get a booting ROM
I think you are on the right track about the Boot.img Prinny. Unfortunately the RUU is going to fail because the phone is s-on and the bootloader is unlocked. The bootloader has to be re-locked before running the RUU.... So there's the dilemma... He needs fastboot to be able to re-lock the bootloader, and really to run the RUU as well....
