[Phoenix Gamma]

It won't launch the rom? Or the emulator? What emulator are you using? I've been having the most luck with SNES9x, which worked without any configuration for me. Something might be in the wrong folder, but I'm not sure. dl.qj.net has working downloads, incase you suspect your download really was corrupted.

Also, firmware might be the problem. Some emulators require them to be in GAME150 instead of GAME depending on the firmware, though I'm pretty certain newer custom firmwares don't require GAME150. But definitely give that a shot. I think this only works on fat PSPs with 1.50 kernel installed.

Lastly, make sure you have the newest version of the emulator (dl.qj.net has just about everything), since some were rewritten for newer custom firmwares that don't support 1.50 kernel. If the newest version doesn't work, try updating to newer custom firmware like 5.50 GEN or 5.50 Prometheus.

So yea, it's gotta be one of those three. Corrupted file(s), a misplaced folder somewhere, or your emulator or firmware is outdated.