How To Downgrade PSP 6.61 To 6.60! (Chronoswitch Downgrader) 2017! - YouTube
How to Downgrade PSP Firmware - Nerd Bacon Reviews
PSP FW6.61から旧FWバージョンにダウングレードする方法 | Kotyan Life
Got this baby. System version is 6.39. Never been hacked. What should I do to hack it? 6.60 or 6.61? Confirmation button is O. Can I switch it to X with Infinity
PSP: First hacks for the new Firmware 6.61 - PRO CFW & Downgrader 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
PSP FW6.61から旧FWバージョンにダウングレードする方法 | Kotyan Life
PSVita: Qwikrazor87 releases PSP 6.61 PRO-C f3 & Hello World 3.36FW with ePSP 6.61FW - Hackinformer