-- Formating the card as BTRFS as found in Answer to this question / via SSH. [root@localhost nemo]# umount /dev/mmcblk1p1 - unmount the card [root@localhost nemo]# mkfs.btrfs -f /dev/mmcblk1 - format the card (no need for partition) [root@localhost nemo]# mount -o subvolid=0 /dev/mmcblk1 /media/sdcard - mount the card [root@localhost sdcard]# btrfs subvolume create Jolla - create folder called Jolla [root@localhost sdcard]# chown -R nemo:nemo /run/user/100000/media/sdcard/Jolla - set ownership [root@localhost sdcard]# chmod -R 775 /run/user/100000/media/sdcard/Jolla - set permissions you may have to manually mount the µSD card or use script (1.0.3.8 Naamankajärvi)