Since posting this question I have been trying to intentionally corrupt the router filesystem, by simulating power outages while writing files and various other things.
Even after many tries, I have not yet been able to corrupt the filesystem so fsck cannot repair it without manual intervention. However, if power is removed while the 'reorder_kernel' script runs, the system will become completely unbootable. I could do this multiple times. A situation could be that the electric grid is unstable, so power will return and a new outage will occur shortly after, if this happens during the boot process at the exact time 'reorder_kernel' is running, the system will break because of a corrupt kernel and repair is not possible remotely. Is there a way to avoid 'reorder_kernel' during the boot process and run it manually instead? Thanks in advance. Mogens Jensen