GA7.70RMIN RV 770 System Software Missing

[Bricked RV]

The GPS unit worked yesterday on my current trip. When turned on this morning to start a new leg on my journey, the screen displayed "System Software Missing". I've tried re-booting but keep getting the same message.
I've tried holding the power key and upper left side of screen to enter Pre-Boot mode with no success. The Garmin logo appears and shortly after I get "System Software Missing".

Model: Garmin RV 770
HWID: 2684 (Used Go to Win to find)
Software Ver: 7.70

I've downloaded the Updater.exe and RV_Camper770_770.gcd from Garmin but haven't made any attempt to use the files since I can't put the device in MTP mode.

Basecamp can see the device connected via USB cable, but Garmin Express can't find it.

Any suggestions are greatly appreciated.

[Boki]

Hope it's just a software leak, otherwise the chip has been damaged (possible)
In the first case, reinstallation of firmware and software. Other - RMA or service

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