I've re-formatted as I didn't have MS-DOS Bootable selected. When I connect now with setting 'MTP Auto Detect' instead of 'MTP USB Device' in the Device Manager it says 'BMW Motorrad Navigator V' which is progress.
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But it is still not found in Garmin Express...
If I set the device to Mass Storage as per your link I assumed it will just set the drive as a USB storage device. I didn't think it was recognised by Garmin Express in this mode but I will try and report back.
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