I've recently tried to change my gameboot to the custom one. The thing is, that I've done something wrong and now every time I try to boot my games (UMDs, emulators), the screen freezes and then the psp turns off . It doesn't run the custom firmware now (because it doesn't boot up) and I can not use it to change the psp mode back to "flash0".
My custom firmware is 6.61. The homebrew works just fine.
Thanks
Advertising