Umbrel won't boot

Hello!
My Umbrel won’t start, I’m running a Raspberry Pi K400 and I connected a screen to it to check.
It says No bootable partition and just keeps trying.

I’ve run fsck on both the SD-card and the SSD-drive on my Ubuntu laptop and it says they’re clean, I can also mount them and see the contents.

Are my SD and SSD OK? Is the Pi broken?

Any ideas would be greatly appreciated!

Cheers