Bricked means something bad happened reflashing firmware and the dosnt work anymore software wise, You can unbrick any psp but the bricked id storaage psp
As for the psp custom firmware installing
get despertar del cemeterio (the newest release) and put it on the memory stick with the sony firmware and custom firmware
And you need to make a pandora battery
This needs another psp with CUSTOM FIRMWARE
Or you need to take apart the battery and take of the tiny tiny pin (forgot which)