USE AT UR RISK!!!!!!!
ok...imma tell u wut i use. You can use recovery flasher 1.60, OR nandmanager v.51
NandManager_v0.51.zip
Lets say u are on 5.00m33-6.
Add nandmanager to your PSP/GAME folder. Run the app from XMB.
Make a nand backup of my 5.00-6m33 NAND, then upgrade to Gen-A. After you installed Gen-A run nandmanager.Make a backup of Gen -A .
A new folder will be created at the root of your memorystick
nanddump. Inside it contains Your IDstorage and the dumps of both CFWs
This folder is about
70 mbs large so be sure that you got space before doing the CFW dumps.
Nandmanager is a quick ways to switch between the two CFW's
Only Use Your Nand Dumps. Using Dumps from another psp will PERMANENTLY FUK UP UR DEVICE.
Made this video to demonstrate how its done.....sorry about the cam.
Hope this helps