tuukka

1. On a phone that's still working:
    mount -o subvolid=0 /dev/mmcblk0p28 /mnt/

2. On a Linux laptop:
    ssh jolla tar c /mnt/factory-@ >factory.tar
    ssh jolla tar c /mnt/factory-@home >factory-home.tar

3. On the working phone again:
    umount /mnt