Here is the CFW 6.20 Mad
1. Need 6.20 Official firmware
2. Need 6.20 CFW MAD-001
3. Create a UPDATE folder.
4. Rename OFW eboot.pbp to 620.pbp
5. Put both 6.20.pbp and Eboot.pbp (CFW) into the UDPATE folder
6. Upload the UPDATE folder to GAME MS directory
7. Run it.
Doesn´t work with boards higher then 8b/sometimes c