Copio y pego de pspupdates.
A lot of changes have been happening in the PSP homebrew community. Firmware updates, custom firmware - it can get quite confusing for a lot of people. Just so there's a minimum of confusion (and complaints), 0okm has graciously decided to post the following info on his blog:
TA-082~086 PSP with CORRECT HACK,
it can run ALL FW1.00/1.50 Official / Homebrew software !!!
(except Official FW1.50~2.50 UpDate EBOOT.PBP)
TA-082~086 PSP with CORRECT HACK can run Any FW(1.00~3.03)
it can't run Official FW1.50~2.50 UpDate EBOOT.PBP
but it can run UnOfficial Up/DownDate EBOOT.PBP
if a FW1.00/1.50 TA-082~086 PSP can't run ANY FW1.00/1.50 Official / Homebrew software,
that mean it haven't CORRECT HACKed
Si esto es cierto es una grandisima noticia.