This is the New Custom Firmware (CFW) 6.60PRO B-10 for all PSP Models.
This is a Light CFW (LCFW) so this will work on PSP 3000 and Go.
PSP 1000 and 2000:
After Downloading the files and extracting them you should see a CIPL folder, FastRecovery folder and a PROUPDATE folder. Take the PROUPDATE and CIPL flasher folders and place them in the ms0:/PSP/GAME folder for either OFW or CFW install and then exit USB mode. On the XMB run the PRO UPDATE and then let it reboot, once you've done that, run the CIPL flasher, if you have one installed already, reinstall it and your done you now have CFW 6.60PRO B-10
PSP 2000V2, 3000 and GO
After Downloading the files and extracting them, take the PROUPDATE folder and place it in the ms0:/PSP/GAME folder as well as the FastRecovery Folder. then exit USB mode and go to the PSP XMB. Run the PRO UPDATE and then let it reboot. After that use the Fast Recovery as your recovery menu and plugin manager.
Link: DOWNLOAD
UPDATE TO OFW 6.60
Download this OFW 660.PBP and change the name to EBOOT.PBP and place it in an UPDATE folder in ms0:/PSP/GAME folder and run the installer from the XMB and then use the PRO UPDATE to flash install CFW.
OFW LINK: DOWNLOAD