PSP Custom Firmware Guide For All Models 2023 - pspunk
PSP 6.61 Firmware Update Download
So I downloaded the 6.61 update and when I try to install it it displays this error and I don't have a custom firmware so If anyone know how to solve this
Tutorial : install 6.61 Pro c2 cfw - YouTube
PSP update: 6.61, firmware, PlayStation
Upgrading PSP OFW 3.90 to 6.61 without a battery : r/PSP