D-Link DNR-4020-16P User Manual page 148

Section 3 - Configuration
Cloud Update
Current firmware version number.
Current Version
It shows the latest firmware version number after checking
Latest Version
FOTA server.
Enable or disable to auto check the latest firmware version with
Auto Check
FOTA server.
latest Version
Enable or disable to auto update device firmware.
Auto Update
Setting hour, minute and the day for auto firmware update.
D-Link DNR-4020-16P User Manual 143