I am confident to do firmware updates having had the answer from Arcam. I am reluctant to do the reset just for the sake of it until I see a report from someone who has actually done it. The main reason for that is it clearly isn’t intended as an end user process or it would be documented in the manual and as such if something were to go wrong it would likely invalidate the warranty.
It’s handy to know there is a process and gives more confidence when doing a regular firmware update which is a user process.