PSP: Custom Firmwares for Firmware 6.61 possible - Currently being updated! - Wololo.net
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
Why do so many people prefer 6.60>6.61? : r/PSP
PSP 3000/goを含む全てのモデルに対応した、再起動後も改造状態が維持される「6.61 Infinity」リリース [導入方法] | Kotyan Life
modifica psp 6.61 pro-c f3 - Tag su TecnoW
Davee's 6.61 Infinity project update - PSP Go
Modifica PSP 6.61 Infinity permanente – funziona su tutte le PSP – FaiDaTe Retro Games Informatica