Risen from the dead: PSP Firmware 6.61 is now available! - Wololo.net
PSP 6.61 Custom Firmware Install on any PSP - PSP, PSP Slim, PSP 3000, PSP Go & E1000 | Page 19 | Digiex
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
6.61 ME & 6.61 LME now available! : r/PSP
How to downgrade your PSP Firmware with Chronoswitch - Darthsternie's Firmware Archive
Tutorial : install 6.61 Pro c2 cfw - YouTube
Updating The PSP System Software to 6.60 / 6.61 - pspunk
PSP: First hacks for the new Firmware 6.61 - PRO CFW & Downgrader updated! - Wololo.net