Custom firmware
PSP: How to Upgrade from 3.60 m33 to 3.71 m33-2 Custom Firmware
When upgrading and downgrading you need to have at least 78% power in the psp
Continue reading : PSP: How to Upgrade from 3.60 m33 to 3.71 m33-2 Custom FirmwareDownload 3.71 m33 install :Here or download from megaupload
How to Upgrade 1.50 Firmware PSP to Custom Firmware 3.52 m33
Please follow the video the subtitles timing can be wrong sometime.
Download 3.52 m33 MH :Here
or download from Megaupload Megaupload