I see now that uploading my own image accidentally built with
TARGET_ROOTFS_SQUASHFS=y has converted my uSD primary OW partition from ext4 to squashfs.
Is there an easy way to convert it back to ext4 from another Linux machine?
Background: I lost ssh access to the live image due to a misconfiguration. I need to fix that in order to get it working so I don't think I can just flash a new image since I have no ssh access.
If it were ext4, I would just mount the partition on my workstation and edit files directly but since it's squashfs, it is readonly and I do not know how to mount it read-write.
Thanks for advice!
EDIT: I was able to connect a USB keyboard and monitor to the "broken" installation, fix the misconfiguration, and then upload an ext4 image I built so problem solved. I am interested to know if my original question has an answer though.