pspfixer says:
Vinzor said: even better, could you tell us how to do it and give us the stuff to do it? 
O.K.
1) A working PSP with 1.5 f/w
2) A compatible 32Meg NAND flash
Step 1. Interface the 32Meg nand chip to the working PSP with a switch to switch between CE lines on the onboard PSP nand and the new nand.
Step 2. Boot the PSP with CE line selected to onboard. Run homebrew software to reprogram NAND chips in PSP's. Before it start flick the CE line switch to the external NAND.
Step 3. Reboot the PSP. It should boot up on the new programmed NAND.
Step 4. Repeat step 1 with the 3.10 F/W PSP.
Step 5. Boot PSP with CE switch selected to external NAND.
Step 6. Run homebrew program to back up flash to MS. Switch CE to onboard NAND before it starts. You now have a saved 3.10 flash with the IDStorage keys needed to run this PSP correctly.
Step 7. Run homebrew software to reprogram NAND as in step 2. This time program the onboard NAND.
Step 8. Reboot with CE selected to onboard. You should now have a 1.5 PSP with bad IDStorage. Run homebrew NAND reprogrammer and program only the IDStorage you backed up in step 6.
You now have a good 1.5 PSP with correct IDStorage keys.
Easy..
23 Jun 2007 - 00:06
Melbourne Victoria