I used my PSP tons about a year ago, and at some point upgraded to 3.03 OE-A.
I am now reselling my PSP and as a requirement I must upgrade the newest firmware, but I keep getting a (DADADADA) error.
So can someone please help me with the downgrading to 1.5 process? Or how else do I go about upgrading this to the current 5.0 or whatever firmware safely?