Thanks lolypop000. Yes, of course the engineering menu is accessible to me. It just doesn't stay there.
I have found an even easier method than the magnet (since I don't have one on hand): disable Garmin Lock, so I don't have to enter a PIN after turning it on. Then, as stated in the wiki, connect to the PC. Click "Eject Garmin Zumo". It then boots up normally with the door open. (This doesn't work with the PIN prompt enabled.)
Rather than using the program to disable the update message for now I have simply disabled my US map by renaming the two relevant files. We shall see whether that is enough to get rid of the msg.
Regards,
Peter.
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