Picked up a PSP-1000 on firmware 1.0. Any reason to NOT be on 6.61? : r/PSP
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Hi! i got this street model psp and wanted to know if it was hacked, this is the current version, what could i do to know? : r/psphacks
How To Update Any PSP To Official 6.61 In 2018! - YouTube
PSP 6.61 Custom Firmware Install on any PSP - PSP, PSP Slim, PSP 3000, PSP Go & E1000 | Page 19 | Digiex
PSP: 6.61 Infinity - Davee's 'Permanent Patch' for System Software 6.61 - Wololo.net
PSP GO install CFW short notes
Help! Trying to update my PSP-1000 to latest 6.61 FW : r/PSP
PSP update: 6.61, firmware, PlayStation
Custom Firmware freezes PSP 2000 and when I restart it the version is still 6.61 and has not updated | GBAtemp.net - The Independent Video Game Community
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PlayStation Portable (PSP) 6.61 firmware download
Mandatory PSP Firmware 6.61 Released Today, First in Three Years - Hardcore Gamer
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Custom Modded White Sony PSP 1000 6.61 Pro-c With Games Bundle - Etsy
Risen from the dead: PSP Firmware 6.61 is now available! - Wololo.net