Release: Infinity 2.0 – Enables Permanent 6.6x Custom Firmware for all PSPs! - Wololo.net
Hack, Install Custom Firmware on Sony PSP-E1004 Street
How To Downgrade PSP 6.61 To 6.60! (Chronoswitch Downgrader) 2017! - YouTube
PSP de segunda mano y baratas en Lleida Provincia | Milanuncios
JondoComputing: Liberar PSP E1004 v6.60
Permanent 6.6x Custom Firmware For All PSP's! - Forums
PSPHACKS 1.03] Downgrading Your Custom Firmware From 6.61 to 6.60 Using Chronoswitch 7.0 - YouTube
Infinity 2.0 released for the PSP, allows for persistent CFW on all models of PSPs on 6.60 and 6.61 | GBAtemp.net - The Independent Video Game Community