The update process will erase all custom configurations, including your PPPoE credentials and Wi-Fi passwords.

The D810R is an older router. If you recently upgraded to VDSL or FTTH (fiber) , the modem part will no longer work – but you can still use it as a router/switch (disable ADSL, use a separate modem or ONU).

Ensure your router and computer are connected to a reliable power source. Interruption during the write process can permanently damage the router. Step-by-Step Guide to Updating Tenda D810R Firmware Step 1: Download the Correct Firmware

If you own this device and have never performed a , you are likely leaving your network vulnerable to security exploits, suffering from periodic dropouts, or missing out on potential performance gains.