Tenda D305 Firmware Update Link -

Cause: Browser cache issues or using Wi-Fi instead of Ethernet.
Fix: Clear browser cache, switch to an Ethernet cable, and use a different browser (e.g., Firefox instead of Chrome).

Once you have downloaded the firmware file from the link above, follow these steps:

Step 1: Log in to the Web Interface

Step 2: Navigate to System Tools

Step 3: Upload the File

Step 4: Wait for the Process to Complete

Step 5: Re-configuration

Download firmware only from Tenda’s official support site: https://www.tenda.cn or your regional Tenda site (for example, https://www.tenda.com.cn or https://www.tendacn.com). Search there for "D305" and select the correct hardware version.

Once you have downloaded the correct .zip file, follow this exact procedure. A failed update can render the router unusable.

The safest firmware always comes from the manufacturer. As of this writing, the official Tenda download center still hosts the D305 files. tenda d305 firmware update link

Official Download Link:
https://www.tendacn.com/download/detail-3175.html

(Always ensure you are on the official tendacn.com or tenda.com.cn domain. Avoid tendadownload.com imposters.)