Pandora's Battery: The resurrection of the deads
Yeah, the "Service Mode".
This has been the work of the alliance of a lot of developers externally known as "C+D": Nem, joek, Fanjita, Chris, jim, psp250, ditlew, Skylark, Dark_AleX, mathieulh, tyranid, adrahil and Booster.
The battery lets to downgrade any firmware version (including those that Sony releases in the future), and to unbrick bricked psp's (whatever bricked by software psp, not only the ones bricked by that retard of Serafin), in all current hardware. Of course, we cannot be sure about future hardware, but the Firmware Update game has finally come to the end for all current psp's.
More info on Noobz site.
Fuente : Maxconsole
En Resumen, Dark_Alex , Noobz y compañia hicieron una utilidad para utilizar las baterias de las PSPs para desbrickearlas y downgradearlas!!!!