Follow this comprehensive guide to safely update your Tenda D810R firmware. Why You Should Update Your Firmware
Since a factory reset is likely, have your Internet Service Provider (ISP) account details ready. This typically includes your connection protocol (e.g., PPPoE, PPPoA), username, password, and VPI/VCI values.
If you run into issues during or after the firmware upgrade, use these quick troubleshooting tips:
Optimize throughput and stability of your ADSL2+ connection.