Yesterday I updated the kernel of my Reform to 5.19-reform2 and something broke. I could not start the machine anymore, the screen would just say:

Waking up LPC... 0%
No response from LPC

and then go blank. When I got home, I booted off of the sdcard with the rescue image (which is just a normal reform-system-v3 image) and used the following commands to overwrite the borked kernel with a slightly older, working one:

# answer "y" twice
reform-boot-config --emmc nvme

I got the command from, where it is used to setup and NVME and the internal EMMC storage.

Apart from that, I also found this issue that improves the Reform Operator Handbook with documentation about this and other commands: