A pandora battery can be used to put any PSP in to service mode so you can unbrick / downgrade or install custom firmware on to your PSP

Technical Specifications

PSP Pandora Battery. Compatible with both PSP Classic and Slim(PSP-1000 / 2000). 3.6V 1800mAh Li-ion Rechargeable Battery.

Description:

Unbricks/Downgrades/Installs Custom firmware(CFW) onto your PSP. The battery itself has not been physically modified or tampered with in any way. It does not pose a safety risk to it's user. Must be used in combination with a correctly formatted Magic Memory Stick to function correctly. Fully compatible with both PSP Slim and PSP Fat.

What Does Custom Firmware Do??

Custom Firmware unleashes the true potential of your PSP. Custom firmware allows you to run a variety of homebrew applications created and tested by the online homebrew community that will substantially increase the capabilities of your Sony PSP. Among them are, Console emulators, running PSP UMD backups, running different media types, reading ebooks, installing custom theme sets and much much more. The homebrew community is constantly coming up with new homebrew applications so you can never go bored! Make the most of your Sony PSP and get Custom Firmware NOW!

Device Compatibility Check

·  PSP Fat / 1000 All versions supported
·  PSP Slim / 2000 Firmware versions up to 3.95 supported,  Versions 4.01 onwards not supported
·  PSP Slim / 3000 Not supported
·  For more info if your PSP is compatible take a look at this Article