PSP Multi Firmware Mod

my 6 set PSP ^o^

1st PSP w/ FW 1.00

2nd PSP w/ FW 1.00 update to 1.500

3rd PSP w/ FW 2.50 Multi Firmware Mod 50% success
　　　　external FW 2.50, 2.60

4th PSP w/ FW 1.51 Multi Firmware Mod 100% success
　　　　external FW 1.50, 2.50, 2.60

5th PSP w/ FW 2.50 Multi Firmware Mod 50% success
　　　　external FW 2.50, 2.60

6th PSP w/ FW 2.01 Multi Firmware Mod 100% success
　　　　external FW 1.50, 2.50, 2.60

How-To : PSP Multi Firmware Mod
copy PSP internal NAND Flash
program it to a samsung 32MB NAND Flash
wrapping Nand bus for external Firmware