Your question is Safe FOTA Without Bricking. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Describe how you would implement a reliable firmware update mechanism over-the-air (FOTA) for a deployed tactical radio without risking bricking the device in Trellisware Technologies deployments.