You can only download a binary image not the code. You cannot modify this... (well technically you can, but you it takes months and you need to be a machine code genius)
A binary image is only good as a backup. Google avrdude backup firmware for details.
You need your supplier to provide you with firmware
Or you start from scratch with a new firmware and make it run with your board.
Edited 1 time(s). Last edit at 08/02/2017 07:10PM by Dust.