If the update resets your router to factory defaults (common), you will need to reconfigure your ISP username/password, SSID, and Wi-Fi password. Always keep a backup of these settings.
Ensure that you downloaded the firmware meant for the exact hardware version (e.g., V1 vs V2) of your Tenda D305.
Type the default IP address for Tenda routers into the address bar: (or re.tenda.cn ) and press Enter. Update Software in TENDA D305
Before beginning the update, take these essential precautions to avoid "bricking" your router: How to update your router's firmware - TeamViewer
Select your exact model and click on the or Firmware tab. If the update resets your router to factory
Tenda D305 300Mbps Blazing-fast & Stable ADSL2+ Modem Router
Locate the latest firmware version that strictly matches your router's hardware version. Type the default IP address for Tenda routers
Ensure your router and computer have stable power. A power loss mid-update will corrupt the router's operating system.
If the update wiped your configuration, log back into 192.168.1.1 using the default password admin . Run the and re-enter your ISP internet credentials and Wi-Fi password. Unable to Access 192.168.1.1
Note down the exact model and hardware version (e.g., V1.0, V2.0). 3. Download the Correct Firmware File
You have likely downloaded firmware for the wrong hardware revision or a different router model entirely. Double-check your router's bottom sticker and re-download the correct file.