Ok, I have always used the method for downgrading my custom firmware as it was presented in the DAX's readmes, but one of my friends semi bricked PSP, (he had 3.03 OE) and simply created a folder RECOVERY in PSP/GAME and put 1.50 update (named as EBOOT.PBP) and run the recovery from the recovery mod, and it worked. I am totally confused?! How the hell is that possible?
btw when PSP booted in 1.50 it just said "Contact sony computer entertainment technical support line for assistance", and simply entered XMB.
Now my question is, how is that on earth possible to do without the files provided in Flasher for recovery folder (RECOVERY folder - decryptprx.prx, EBOOT.PBP, extprxs.pbp and libpsardumper.prx)?