PSP: Custom Firmware M33 source released for popular tool's 10 year anniversary - Wololo.net
PSP 2001 won't play any PS1 classic games from the PSN store with the CFW 6.61 LME-2.3. Changed the ISO to M33 to no avail. Am I missing something here? : r/PSP
Custom Firmware M33: MENU VSH | PSP.SceneBeta.com
UPGRADE ANY PSP CFW 5.00 M33 TO CFW 6.60 ME-2.3 [ PSP 1000 ] No TA-082 - YouTube
Custom firmware 5.00 M33 released for PSP | Tech Ticker