All firmware you need here: From 1.50 install 3.52 M33 1 - If you are under official 1.50 PSP firmware, copy kxploitpatcher and kxploitpatcher% folders from '1.50only/' of this download to your 'ms0:/PSP/GAME/' and use it. 2 - Download official 3.52 eboot, rename it to 352.PBP and place it on 'ms0:/PSP/GAME/M33CREATOR/' or 'ms0:/PSP/GAME150/M33CREATOR/' 3 - Download official 1.50 eboot, rename it to 150.PBP and place it on 'ms0:/PSP/GAME/M33CREATOR/' or 'ms0:/PSP/GAME150/M33CREATOR/' 4 - Go to Games/Memory Stick on your PSP, and execute '3.52 M33 CREATOR'. Once finished, it will go back to the XMB. 5 - Go again to Games/Memory Stick on your PSP, and execute '3. Can Tago Mago Rar Download here. 52 M33UPDATE'. You'll have to press X to agree to the installation. 6 - When finished, press X to shut down and reboot manually.

The official firmware, but also enables the use of homebrew. Update: MakeUseOf released a Free PSP Downgrading/Upgrading Guide in PDF. Download here. This time you must also put the versions 1.50, 3.40 and 3.80 eboot files in the PSPs root (main folder) and name them respectively 150.PBP, 340.PBP and 380. PSP Firmware 1.50 PSP Firmware, Official Firmware, PSP Downloads, Official firmware 1.50 update EBOOT for PSP, primarily used as a helper file with HEN, a homebrew enabler capable of downgrading a PSP to 1.50 under the right conditions. In the past, it has also been essential to the installation.