HINT Control is a cross-platform and open source app for viewing advanced information about your Home Internet gateway and controlling hidden settings.
Currently, the Arcadyan KVD21, Arcadyan TMOG4AR, Sagemcom Fast 5688W, Sercomm TMOG4SE, and Nokia 5G21 gateways are supported. The Askey TM-RTL0102 can't be controlled with this app.
NOTE: Don't disable the 2.4GHz and 5GHz radios in the "Wi-Fi" section unless you have a wired connection to your gateway. These will disable the Wi-Fi and prevent you connecting to the gateway wirelessly.
Check out the source code and releases for other platforms: https://github.com/zacharee/ArcadyanKVD21Control/.