PSPsetX

Similar to PSPset - except for 2.0 firmware users. This handy tool allows you to:

Easily and safely downgrade to 1.50! Simply select downgrade, and launch the 1.50 update from the PSP menu afterwards!

* Change Gameboot
* - Change Gameboot = copies the Gameboot.pmf from ms0:/Gameboot.pmf into the flash
* - Backup Gameboot = copies the Gameboot.pmf from the flash into ms0:/Gameboot.pmf
* - Restore original Gameboot = Restores the old gameboot.pmf

* Firmware Tweaks
* - Set Version 1.00 - 2.5 = Sets your PSP Version to 2.5. You can now also play games which require 2.5

* Change X-O-Buttons
Before using this please restore factory settings
* - Set X as enter (US / EU) = now X = enter at the psp menu
* - Set = as Enter (jp) = now O = enter at the psp menu

* Stuck Pixel Cleaner
* - Start cleaning = takes about 20 minutes

Download Link.