| you need another psp (homebrew-able) to make a pandora battery and memstick google it and then use the pandora extender to allow the booting of 1.5 apps with access to the flash.
p.s. might be a long shot but you might be able to use pandora battery on its own to flash 1.50 as the custom ipl might stop the idstorage being a matter (or the pandora battery might try to fix the idstorage itself) good luck.
__________________ Black PSP 2.71 SE-C EU 
Black PSP 3.71M33-2 EU
Black Slim PSP 3.71M33-2
Nintendo DS + M3dssimply
Nintendo Wii + Wiikey
Xbox Self Chipped, Xbox 360 NME Self Chipped
Ps3
1GB Sandisk MS Duo, 2GB Sony MS Duo, 4GB MS Pro duo, 4GB Datel Harddrive
Grand Theft Auto LCS
Grand Theft Auto VCS
3600mAh External Battery
+Plenty of Homebrew |