During operation, the FRITZ!Box checks for updates for all of the registered DECT devices every 48 hours and within 30 minutes of being restarted. If the FRITZ!Box finds new firmware, it is updated automatically. The firmware version it finds depends on the version of FRITZ!OS installed on the FRITZ!Box. You can see which version is installed if you select the menu "Telephony > DECT > Monitor" in the FRITZ!Box user interface. Power to the connected devices is not interrupted during an update.