| I'd make a pandora memstick and battery (can be made back to normal) and use it to downgrade to 1.50 so it formats your memory and restarts you form scratch, dump a copy of your idstorage for safety and maybe your entire nand. then from there reupgrade to which ever firmware you wish (make new update eboots to avoid corruption.)
__________________ 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 |