I have flashed a lot of roms over the last couple of years on my evo. Awhile back I lost my GPS functionality and have not been able to regain it by flashing another rom. I think it may have something to do with partitioning the flash card and using dark tremors a2sd for one of the old MikG roms. The problem is I don't know if that is causing problems with the roms I am running now. What do I need to do to wipe everything and start fresh?