Hello,
You can unregister your device from RMS, by connecting to your device via SSH protocol, e.g. using "Putty" application for Windows:
- SSH login: root
- SSH password: <your device's password>
and using the following SSH command:
uci set rms_connect_mqtt.rms_connect_mqtt.remove_from_system=1 && uci commit && /etc/init.d/rms_connect restart