Release: Infinity 2.0 – Enables Permanent 6.6x Custom Firmware for all PSPs! - Wololo.net
How to Mod Any PSP on Firmware 6.61 or Lower! - Infinity 2.0 Permanent CFW - YouTube
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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
Release: Infinity 2.0 – Enables Permanent 6.6x Custom Firmware for all PSPs! - Wololo.net
Guide to: Converting PS1 games for PSP | Page 21 | GBAtemp.net - The Independent Video Game Community
PSVita: Qwikrazor87 releases PSP 6.61 PRO-C f3 & Hello World 3.36FW with ePSP 6.61FW - Hackinformer