If you are running on RPi, just shut down, take out the mSD card, reflash it with latest Umbrel OS, put it back and start. Wait until it resync the latest blocks and done.
If you do not run on RPi, just stop umbrel scripts, run manual update as described in this troubleshooting guide.
Be aware! Running on a non-RPi, require first to do an update for your OS. Do that first (with Umbrel stopped). Restart machine, do the manual update of Umbrel and start the umbrel scripts. Done.