Updating The PSP System Software to 6.60 / 6.61 - pspunk
Sony releases first PSP patch since 2011
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
How to downgrade your PSP Firmware with Chronoswitch - Darthsternie's Firmware Archive
PSP 6.61 Infinity Hybrid Firmware by Davee, LME & PRO CFW Patch | PSXHAX - PSXHACKS
Picked up a PSP-1000 on firmware 1.0. Any reason to NOT be on 6.61? : r/PSP
Tutorial : install 6.61 Pro c2 cfw - YouTube
How to Update Your PSP Firmware
How to Download PSP Games and Transfer them to Your PSP
PSP: Chronoswitch 7.0 downgrader released - Wololo.net