Is it really possible to do a firmware upgrade without any buttons attached to the module on a ATMega 1280 board? ( The ARM based boards can do it) reason for asking, I have built in a MD module in my cajon...so it is a complete black box solution...just to connect it to USB.
To do a firmware upgrade I now need to unplug it...and replace it in my ARM based device...so I get the buttons and screen.
Best Regards
Angr77