I have come back to my PSP after a year-long absence.
My PSP (phat) updated fine from FW4.01 (I think) to FW5.03 via the M33 online update. Being an idiot I messed about and things went wrong and now have a semi-brick... yes, I can get into the recovery menu.
So, after some forum hunting I downloaded 'Hellcats Recovery Flasher', and moved the RECOVERY folder (with EBOOT.PBP and 371.PBP) into PSP/GAME and copied 500.PBP into the root as per instructions.
When I activate recovery mode and select the "Run program at /PSP/GAME/RECOVERY/EBOOT.PBP" option nothing happens... no MS access, just hangs on green power button for 10 seconds as per normal semi-brick.
Any hints on what I should do to unbrick my PSP?