Upgrading PSP OFW 3.90 to 6.61 without a battery : r/PSP
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[Tutorial] Install PSP 6.61 Pro-C Infinity Custom Firmware | GBAtemp.net - The Independent Video Game Community
psp – Wololo.net
Sony PSP CFW 6.61 on PSP-1000 and PSP-3000 - YouTube
Tutorial] Install PSP 6.61 Pro-C Infinity Custom Firmware | GBAtemp.net - The Independent Video Game Community