Welcome to your interview.
The question is on your right: Safe FOTA Without Bricking. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
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.