: Click "Choose File" and select the downloaded firmware file (e.g., version 3.2).
Some gateways support a hidden diagnostic page: http://192.168.18.1/cgi-bin/telnet (if enabled by carrier) – but this is rare. nokia fastmile 5g gateway 3.2 firmware download
“Can you push the latest firmware version to my Nokia FastMile 5G Gateway 3.2? I’m experiencing [stability/speed/connection issue].” : Click "Choose File" and select the downloaded