Here is the top advice and steps for updating your Tenda D301 V4 safely.
Before initiating an update, specific precautions must be taken to prevent permanent damage to the device: Wired Connection Only: tenda d301 v4 firmware update top
If the router becomes unresponsive after the update (power light is blinking and not turning solid), you may need to perform a "hard reset" by holding the reset button on the back of the device for 10–15 seconds while powered on. Here is the top advice and steps for