PSP: Custom Firmware M33 source released for popular tool's 10 year anniversary - Wololo.net
Mathieu Hervais on Twitter: "Rebuilt DTP-H1500 1.50 firmware flashed and running on a DTP-H1500 unit. Also for the lulz, I included a picture of the 1.50 DTP-L1500 kernel running a 1.52 testingtool
PSP Slim security trounced by Team M33's custom firmware | Engadget
Downgrading a 3.80 PSP | Psp, Song of style, Linkin park