: Never update firmware over Wi-Fi. A dropped signal can "brick" your router. Use an Ethernet cable to connect your PC directly to one of the LAN ports. Backup Settings

The reset cleared your QoS settings or channel selection. Solution: Log in, go to Wireless Settings , change the channel from “Auto” to a fixed channel (1, 6, or 11 for 2.4GHz). Also, ensure “Bandwidth” is set to 20/40MHz.

The older Tenda F6 does not support app-based updates. You must use the web interface at 192.168.0.1 .

Connect your computer to the router via an Ethernet cable (avoid Wi-Fi for updates).