For changing config files in Venus OS I found the hint on Github: Since the root filesystem is mounted read-only, you will need to remount it to read-write before you can edit the file. There are three ways to change that: temporally: issue the command mount -o remount,rw / (which holds until the next reboot or issueing mount -o remount,ro /) semi-permanent: issue the command /opt/victronenergy/swupdate-scripts/remount-rw.sh (which holds until the next firmware update) Maybe it is relevant...