In the link you've posted there is only a firmware for the Atmega644, so i went on the link (viewtopic.php?f=3&t=1630) in that post and i updated
the firmware with version "megadrum_20110623.bin for the Atmega 1284.
After reboot the MD display shows:
20110623 16MHz
So still the 16MHz and still no firmware ersion indicated in MDM and no MIDI activity in the MIDI log.
Thx
Christian