Restoring from BTRFS SD card

[nickfx]

Not sure this works. I was able to add 'rescue' to cmdline.txt on xbianroot partition. But /etc/default/xbian-initramfs is inaccessible.

I booted with the changed cmdline.txt but still cannot access anything: USB hubs and ethernet aren't working, hence wifi isn't working and I can't use a directly connected keyboard either.

LZ4 compression was set to enabled, by the way.

Ubuntu 18.10 apparently uses lz4 compression, too.

Do you have any idea how I could access the files from my main computer (i.e. mounting the SD card)?