Ensure your router is plugged into a stable power source. Do not turn it off during the update process. How to Update Tenda F3 Firmware
Explaining how to set up on the new firmware.
Never update firmware over Wi-Fi. If the wireless signal drops during the installation, the router may fail permanently. Use an Ethernet cable to connect your PC to a LAN port on the F3.
Ensure your router is plugged into a stable power source. Do not turn it off during the update process. How to Update Tenda F3 Firmware
Explaining how to set up on the new firmware. tenda f5 firmware
Never update firmware over Wi-Fi. If the wireless signal drops during the installation, the router may fail permanently. Use an Ethernet cable to connect your PC to a LAN port on the F3. Ensure your router is plugged into a stable power source