Ok, I see my mistake, I did not tried to launch Joyloader while in bootloader mode (a little difficult, you only have a few seconds after manually restarting the device). Working OK now.
I have one more question: How does the buttons matrix work ? Is it similar to Leo Bodnar's BU0836?
Thanks for your help.

Last edited by Eogund; 02/21/14 04:45 PM. Reason: Very bad english