Visit the main Tenda Download Center.
Upgrading firmware can sometimes reset your router to factory defaults. Write down your PPPoE internet username and password provided by your ISP, or go to Tools > Backup/Restore in the router settings to save your current configuration. Step-by-Step Guide to Update Tenda D305 Firmware Follow these instructions carefully to upgrade your device: Step 1: Connect to the Router's Web Interface tenda d305 firmware update link
To avoid downloading malicious software, always obtain your firmware directly from the official manufacturer. Visit the main Tenda Download Center
The router will now upload the file and install the new firmware. The progress bar will move, and the router will reboot automatically once the upgrade is complete. tenda d305 firmware update link