Here's my PSPs, top i bought back in 2008 modded and still on 5.00m33-6 but it's missing the kratos battery cover the other my brother got it for me for xmas this
Custom Firmware 5.00M33 を導入する
Custom Firmware 4.01M33を導入する
M33's CFW 5.00 M33-3 on PSP-2000 series | LifeDrive
Despertar del Cementerio! – Unbricking PSP 3000 & the legendary 5.00 M33 CFW via Pandora! - YouTube
10th Anniversary of M33 - Hackinformer
Hack A PSP With Another PSP - Prime Inspiration
How to remove m33 from my psp : Hello I just got my first psp from eBay and It was untested since there was no battery, and once the battery came in
PSP: Custom Firmware M33 source released for popular tool's 10 year anniversary - Wololo.net