No doubt one of the handiest homebrews for keeping your PSP fully functional and fully intact: Hellcat’s Recovery Flasher v1.60.

Flash a fresh version of Custom Firmware M33, which can be useful for recovering a semi-bricked PSP, upgrading and/or downgrading between different CFW versions, etc… Make and restore NAND dumps, backup/restore your XMB themes, system settings, PSN activation, and flash memory. All that without Pandora; See the README.

Download: Recovery Flasher v1.60

- source: qj