Risen from the dead: PSP Firmware 6.61 is now available! - Wololo.net
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
Hack, Install Custom Firmware on Sony PSP-E1004 Street
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PSP Go OFW 6.60 - CFW 6.60 Pro C-Fix 3 crash · Issue #523 · pavel-demin/procfw · GitHub
PRO Firmware PSP - GameBrew
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Sony PSP-2000 Ice Silver CFW 6.60 Japan Region, Plays English/Japan (See desc) 4948872411530 | eBay
PlayStation Guide
Sony PSP Playstation Portable Bundle Remote Control 64GB 6.60 CFW Charger | eBay