Download the firmware binary file (usually ending in .bin or .tar ). Never download firmware from third-party, unofficial forums, as they may contain malware.

This usually means the firmware file is corrupted or for the wrong hardware revision. Redownload the file and try again.

Log back into the gateway via Ethernet. Go to the WLAN settings tab, re-enable your 2.4GHz and 5GHz wireless bands, and set up your Wi-Fi name (SSID) and password again.