What does your DHD 4300 currently run (Windows CE or Android)?
Unplug the USB drive immediately. Leaving it plugged in may cause the system to trigger the update loop again on the next boot.
The DHD 4300 should automatically detect the file and display a prompt saying
If you encounter issues, download the stock DHD 4300 firmware v8.0 from the official DHD support portal or request it via their customer service.