Tenda often releases different hardware versions (e.g., v4.0 or v6.0) for the same model. Installing firmware for the wrong hardware version will damage the machine. Check the label on the back of your router to find your specific version.
Use an Ethernet cable to connect your computer to the FH456’s LAN port. A WiFi dropout during a 2-minute update will corrupt the firmware, requiring a factory recovery. tenda fh456 firmware update top