Before beginning the update, take these essential precautions to avoid "bricking" your router: How to update your router's firmware - TeamViewer
You cannot update blindly. First, log into your TENDA D305 interface. Update Software in TENDA D305
You know that feeling when your router starts acting like it’s running on dial-up dreams? 😴 That was me last week – buffering icon became my new wallpaper. Before beginning the update