Same issue here, I see there is synchronisation progress through ssh. I plan for waiting for it to end before rebooting. Has waiting the end of synchronisation and then rebooting worked for anyone here?
Edit:
I just found how to solve my problem! Through the guide here : Umbrel Troubleshooting Guide
And in the section: Login screen it just freeze, can’t login
And I haven’t lost any sync progress, now I’m in the dashboard!!