Turris Omnia: After sysupgrade overlayfs partition only 100M

@mdzprocter I'm not sure who sent you on the fool's errand of probing /dev/mtd0 (and running strings /dev/mtd0 | grep -i error on it), since that contains your bootloader. Thats a read-only partition.

As @anon89577378 pointed out your device uses DSA as of 21.02 so you should at least wipe /etc/config/network prior to upgradiing from 19.07.

BTW, an online search on your issue points me right to this topic:

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