I am trying to upload firmware on my APM 2.7 board and I saw that the highest version of ArduCopter that the APM boards can have is 3.2.1 so I went to the all options page on the Install Firmware and put the matching information and then it gave me this weird error. Can anyone help?
Use a mission planner version from 2015 and it will work fine
Where would I be able to download older versions of mission planner.