Accidentally deleted it my ass lol
Can you still access the recovery menu? If so, obtain a psp recovery folder with the 1.50 eboot and relevent files and go to run program at psp/game/recovery/... that will put 1.50 back on it, then you need to go back to custom firmware again.
Next time if you see loads of files that you never put on there, chance are Sony did so LEAVE THEM ALONE! lol
Kev
