Never update firmware over Wi-Fi. A sudden signal drop can corrupt the installation. Use an Ethernet cable to connect your PC to the router.
Updating firmware is not just about getting new features; it is a critical maintenance task for several reasons: D-link Dwr-m920 Firmware Update
Protects your network from evolving cyber threats and unauthorized access. Never update firmware over Wi-Fi
To avoid "bricking" your device (making it unusable), follow these precautions: D-link Dwr-m920 Firmware Update
Resolves known issues like unexpected reboots, Wi-Fi drops, or slow speeds.
After a successful update, it is often recommended to perform a to ensure the new firmware runs on a clean slate. Note that this will erase your Wi-Fi name and password settings, so you will need to re-configure them.