Recently got a psp-3000, asking if I can just update it straight from 4.20 to 6.61 firmware? Thanks. : r/PSP
PSP 6.61 Custom Firmware Install on any PSP - PSP, PSP Slim, PSP 3000, PSP Go & E1000 | Page 18 | Digiex
PSP update: 6.61, firmware, PlayStation
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
How to downgrade your PSP Firmware with Chronoswitch - Darthsternie's Firmware Archive
Mandatory PSP Firmware 6.61 Released Today, First in Three Years : r/Games