: Download the firmware files (usually around 2GB) and extract them to the root directory of a 16GB+ USB drive. Installation
Fixes muffled voice quality during Bluetooth hands-free calls. Connectivity: Md-0820 Software Download
Select the Software Version tab. If the system recognizes the MD-0820 files on your USB, the "Update" button will become active. : Download the firmware files (usually around 2GB)