few days ago done this: recover perma bricked psp (3.51m33 ta082/6) with pandora, went to 1.50 then installed 3.52m33 and update 4 after that. Then custom ipl and fixed/unpatched all keys + key5 then i made a nand dump and there was no bad blocks. today i flashed 3.52m33-4 over 3.71ta079. the nand was taken from ta082 , so make nand dump from ta082/86. that i read is the most nand backups with bad blocks r made from ta079/81. u should try. btw mine mobo is ta081 but i didnt tried to make a nand from my fw.
sorry for my bad english, i do my best
