My friend bought a used PSP yesterday and I downgraded it from 3.50 to 1.50 then upgraded to 3.40 OEA. Worked fine. I installed a Wii theme for him, decided to put a Gears of War theme on, so I completely deleted his flash0 and put in a fresh copy. Since then, it hasn't been able to boot up. I copied the flash0 out of my working PSP and put it in his, but that didn't work either. I can't think of what I've done wrong. His motherboard is older than mine. Mine's a TA-082, and his isn't. Should I downgrade back to 1.50 and go back up, or is that possible? What should I do? Thanks.