My Droid Inc recently died so I picked up a HTC thunderbolt on craigslist. it works great and was already rooted so I have been flashing ROMS to find a good daily driver, but when I went to flash a new kernel, I can flash the zip file off my SD card and though it says it instals, it never changes... I have tried multiple kernels but no luck. I double checked and the phone is definitely S-off. Any suggestions?