If the screen freezes for more than 30 minutes, wait 5 minutes after turning off the unit before trying again with a different USB stick.
Select the Software Version tab. If the system recognizes the MD-0820 files on your USB, the "Update" button will become active. Md-0820 Software Download
The update process takes approximately 10–25 minutes. The screen may turn black or reboot several times; do not remove the USB until the final completion message appears. If the screen freezes for more than 30
Keep the car engine running during the entire process to prevent the battery from dying, which could brick the head unit. Installation Guide Md-0820 Software Download