Picked up a PSP-1000 on firmware 1.0. Any reason to NOT be on 6.61? : r/PSP
Infinity 2.0 released for the PSP, allows for persistent CFW on all models of PSPs on 6.60 and 6.61 | Page 2 | GBAtemp.net - The Independent Video Game Community
Psp Filer 6.61 Free Download
Updating The PSP System Software to 6.60 / 6.61 - pspunk