PSP: Custom Firmware M33 source released for popular tool's 10 year anniversary - Wololo.net
Despertar del Cementerio! – Unbricking PSP 3000 & the legendary 5.00 M33 CFW via Pandora! - YouTube
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
10th Anniversary of M33 - Hackinformer
Upgarde PSP CFW 5.00M33-6 to 5.50GEN-A to GEN-B - YouTube