@trulm You can make the system files read-only both in SBC and standalone mode. If you are using your board in standalone mode, you need to eject the microSD card, put it in a PC, and toggle the "read-only" flag of the files you wish to protect using a file explorer (in directory sys). In SBC mode, you can connect via SSH and remove the w flag from the files in /opt/dsf/sd/sys using chmod.