New Forerunner 970 stuck in a Boot Loop: map 29

Charged the watch today to 100%. Then the watch started to behave weird. Slow responses to button press and touchscreen.

Tried connecting it to the computer, but computer couldn’t see it. Tried different computer with different OS. Same problem.

Tried soft reboots. No fix. Tried restoring a back up and now the watch is stuck in a Boot Loop.

It loads maps on by one, then tries loading map 29 but takes too long and watch reboots and starts doing the same thing again.

Tried hard reset with the buttons, the settings symbol appears, it looks like it’s doing a factory reset, but when it starts, it tries loading the maps again… with same result.

Any ideas?