can u mod firmware 4.20

[childsy_1985]

i have read else were that it is currently not possible to mod 4.20 is that true or is there a way to do it? Sorry I am new to psp modding and would like to play backed up games

[kornell1us]

i have problem now to mod 4.01....anyone..quite urgent here

[Killer]

No, because 4.20 was only on the PSP3000 and that is unhackable currently.