PSP v3.50 Downgrade Video Tutorial
June 30, 2007 by Abdalla Ahmed
Remember the post about downgrading your PSP? …well we have got a video tutorial for you all to enjoy courtesy of barroni1977
Good Luck & Were here to help, so any problems just comment below 
when i try to downgrage psp 350 get a ipl error and it wont flash
has 350 firmware and get it to say hen then it doesnt downgrade when i go to update help please