Got my PSP GO Today :) it has custom firmware 6.61 : r/PSP
PlayStation Guide
PSP 6.61 Custom Firmware Install on any PSP - PSP, PSP Slim, PSP 3000, PSP Go & E1000 | Digiex
Custom Firmware 6.61 PRO C2: Descargar e Instalar 【2022】
PSP 6.61 Custom Firmware Install on any PSP - PSP, PSP Slim, PSP 3000, PSP Go & E1000 | Digiex
Sony PSP CFW 6.61 on PSP-1000 and PSP-3000 - YouTube
PSP 6.61 Infinity Hybrid Firmware by Davee, LME & PRO CFW Patch | PSXHAX - PSXHACKS
I tried installing 6.61 PRO C2 and infinity v2.0.3 on my psp 3001 (following the instructions on the CFW guide of this subreddit) but it just shows corrupted data when I disconnect,
Davee's Infinity CFW - Permanent 6.61 CFW on All 3000 & Go Models! | GBAtemp.net - The Independent Video Game Community
PSP GO 6.61 Infinity Permanent CFW (PRO) Full Tutorial! 2017! دیدئو dideo
How to Mod Any PSP on Firmware 6.61 or Lower! - Infinity 2.0 Permanent CFW - YouTube
Release: Infinity 2.0 – Enables Permanent 6.6x Custom Firmware for all PSPs! - Wololo.net