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Unable to Install System Software 23.10 on MARQ Aviator

So, I have an Aviator running 23.00

Trying to install 23.10 the old school way, cable, computer, Garmin Express

Express finds that there is new update, it copies it onto the watch (quite quickly) and then asks me to unplug and complete on the watch, all normal so far. 

However, once unplugged, it goes to Loading Maps and then back to Watch Face. No new SW prompt or whatsoever. 

When I check the files on the watch, I can see the SW there, 13.xxMB but the file disappears soon after I unplug the watch from PC. 

No prompts on Garmin Connect for update either. 

Any clues ? 

TIA