For the DWR-M920, D-Link supports the "D-Link WiFi" app (available on iOS and Android).
Before updating your firmware, make sure to: D-link Dwr-m920 Firmware Update
: Check the sticker on the back of your device to identify your hardware version (e.g., H/W: A1 or A2 ). You must download the firmware that matches this specific version. For the DWR-M920, D-Link supports the "D-Link WiFi"