How to Download PSP Games and Transfer them to Your PSP
PERMANENTLY Trick (CFW) YOUR PSP 6.61! 2018 Tutorial - YouTube
PlayStation Portable - Wikipedia
PSP 6.61 Infinity Hybrid Firmware by Davee, LME & PRO CFW Patch | PSXHAX - PSXHACKS
PlayStation Guide
Infinity 2.0 released for the PSP, allows for persistent CFW on all models of PSPs on 6.60 and 6.61 | Page 3 | GBAtemp.net - The Independent Video Game Community
Picked up a PSP-1000 on firmware 1.0. Any reason to NOT be on 6.61? : r/PSP