Butters, nothing happens in either the first or second case.
UPDATER.EXE writes no updates, and nothing happens with the xrgn,14,1:/Garmin/14.bin command. The device reboots immediately. If you change it to xrgn, 14,1: / 14.bin, it is successfully flashed, but nothing happens after the reboot. In Disk Management, the device does not appear in any way.
P.S. The device is constantly in a preboot state. No manipulation of the power button is required to connect to UPDATER.EXE.