How to update firmware

Prerequisites

Install avrdude.

sudo apt update

sudo apt -y install avrdude

Programming LABDOS by avrdude

Please provide a correct path to .hex file.

Also correct name of ttyUSB interface has to be provided.

Then run avrdude.

For 8MHz version

avrdude -v -patmega1284p -carduino -P/dev/ttyUSB0 -b57600 -D -Uflash:w:./LABDOS.hex:i

For 16MHz version (outdated)

avrdude -v -patmega1284p -carduino -P/dev/ttyUSB0 -b115200 -D -Uflash:w:./LABDOS.hex:i