Rock 5B bootloop since update

Dear fellows,

I just installed the update (8.21.1) using dietpi-update coming from version 8.20. After the installation dietpi asked me to reboot as the kernel has been updated (I am using a Rock 5B SBC). Since then the board is no longer booting. The LED is green for about 2 seconds and then turns blue but nothing happens. I connected a monitor via HDMI but no signal is arriving. Neither is the lan port showing any signs of activity.
Could you please help me how I can revive my rock? :smiley:

Please let me know if you need any further information!

Thanks a lot

That is bad.

Do you have another Linux system from where you can access and check the filesystem?

And do you have a USB-UART adapter to check serial console logs?