My umbrel can not boot

My umbrel run pretty well for month. I updated it to v0.5.1 20 days ago and is working well too. But when I reboot it yesterday, it did not work. The light of the network cable is not flashing. I tried several times, but it just can not work. How to fix this?

Hey @Jacky! Sorry that you’ve encountered this issue, are you running Umbrel on a raspberryPi?
In that case, it’d be nice checking the red & green LEDs of the raspberry to troubleshoot the problem. If the network cable is not flashing I suspect your OS is not booting, if you are using a raspberry it may be due to a faulty mSD card.

Yes, it’s the SD card’s problem. I flashed a new SD card. And it’s working now.