D-Link DWR-923 User Manual page 58

System Firmware Upgrade
Firmware will be continually updated as more features are added and
known issues are resolved. This section helps you to upgrade your
firmware to the latest version available online.
Select to upgrade firmware for the DWR-923 system or the LTE module:
1. Click Browse to locate the firmware file from the directory on the
local host.
2. Click Router Upgrade/ 4G Upgrade to begin firmware upgrade.
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