[Nonfractal]

Alternatively,  have some one who knows  "how-to" , do this process for you. 

I've never done any firmware stuff for team KesselRun or team Gas-Monkeys, despite having the dongle as part of our team kit.
We just turn up at a Rockingham oxigen event and Matt Tucker processes us just like all of the other teams. 

Everyone gets flashed with the latest "known good" firmware on chips and controllers whether we want to or not. 

Alan