This method does not work on PSP-3000, PSP Go, or E1000 models. To give you the most accurate help, could you let me know: Are you trying to unbrick a PSP or install custom firmware ?

Do not proceed without backing up your memory stick.

What is the of your PSP (found on the bottom or under the battery)? Are you using a PSP-1000/2000 or a later model?

Requires a compatible PSP (PSP-1000 or some 2000 models) and a specially modified battery. How to Use the pandora (3).rar File

Download the official PSP Firmware 1.50 or custom firmware (like Dark_AleX's). Rename the firmware file to UPDATE.PBP .

Ensure your Pandora battery has a decent charge.