Thanks for the email - I'll give it a try.
These two are just for /sdcard and /extsd: /dev/block/mmcblk0p4 , /dev/block/mmcblk1p1 .
It looks like Kobo has all system images on one device - internal SD card. If so, one can always disassemble Kobo, take out the card, make a full card image backup, and if anything goes wrong - copy the image back to the card.
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