Applicable Models

IMPORTANT: This file is only for use with the models identified. Not all models are sold in all countries.

This information is for the following models:

  • MEX-GS820BT

About this download

Benefits and improvements

This software updates the firmware of your Bluetooth Audio System to version 11 to add a function to allow the user to set the maximum volume to any level from 30 to 50. For example, if you set the maximum volume 40, then the volume cannot be raised above that level.

System Requirements

Operating Systems

  • System Software

File Info

File Name

  • MEX-GS820BT_v1100.zip

File Version

  • 11

File Size

  • 2.77 MB

Release Date

  • 04-09-2018

Before You Start


Before You Start

  • Follow the update instructions carefully.
  • WARNING!
    • WARNING: To prevent the battery voltage from becoming too low during the update process, it is recommended to perform this update with the car (or boat) engine running. Before starting the update process with the car (or boat) engine running, be sure to park the vehicle in a safe place and keep the engine running until the update is complete. This update takes approximately 1 minute to complete.
    • This update requires a computer with an Internet connection and a USB storage device.
    • To avoid Bluetooth connection problems, it is recommended that you delete the Bluetooth pair setting (to the Car Audio device) on your cellular phone and then perform the Bluetooth connection again after the firmware update has been completed.
    • If the AUTO OFF setting was used before updating the firmware, please set the AUTO OFF setting again after completing the update.

Determine if you need this update

  1. Power on the main unit.
  2. Press and hold the SOURCE button (SRC is printed on the button) for 1 second to turn the source off and display the clock.
  3. Press MENU button.
  4. Turn the control dial to display GENERAL, and then press the ENTER button.
  5. Turn the control dial to display SET FIRMWARE, and then press the ENTER button.
  6. Turn the control dial to display FW VERSION, and then press the ENTER button.
  7. If the version number displayed is 11, you do not need to update the firmware.

Download & Install


Download and Transfer the Update File to Your USB Storage Device

  1. Connect a compatible USB storage device to your computer.
    Note: The USB storage device must be formatted for FAT16 or FAT32 file systems.
  2. Ensure your computer is connected to the Internet.
  3. Download the MEX-GS820BT_v1100.zip file to a temporary or download directory (please note this directory for reference) on your computer.
  4. Go to the directory where you just downloaded the update, right-click the MEX-GS820BT_v1100.zip file and, from the menu, click Extract All.
  5. In the Extract Compressed (Zipped) Folders screen, make sure the box next to Show extracted files when complete is checkmarked, then click the Extract button.
  6. Copy the update file to the USB storage device.
    • For Microsoft® Windows® operating systems: Go to the directory where the folder was created, right-click the MEXGS820BT_v11.dat file and, from the menu, click Send To..., and then click the drive (EX: Removable Disk E:) that represents your USB storage device. The file will be copied onto your USB storage device.
    • For Apple® Mac OS X® operating systems: Drag and drop the MEXGS820BT_v11.dat file to the root folder of the USB device.
    WARNING: This update will not be performed if the file is not copied to the root directory of the USB storage device or if the name of the file is modified.
  7. Remove the USB storage device from your computer.

Continue to the next section.

Updating the Firmware of the Main Unit with Your USB Storage Device

  1. Turn on the Bluetooth Audio System.
  2. Press and hold the SOURCE button (SRC is printed on the button) for 1 second.
  3. Press the MENU button.
  4. Turn the control dial to display GENERAL, and then press the ENTER button.
  5. Turn the control dial to display SET FIRMWARE, and then press the ENTER button.
  6. Turn the control dial to display FW UPDATE, and then press the ENTER button.
  7. Turn the control dial to display FW UPDATE-YES, and then press the ENTER button.
  8. When the INSERT USB message is displayed, insert the USB storage device into the USB port on the front panel of the main unit.
  9. The update will start and should finish in approximately 1 minute.
    Note: When finished, the unit will automatically restart from the source OFF state (clock is displayed).
  10. Check the current firmware version to confirm that the update has successfully installed.
    • If the version number is 11, the firmware update was successful.
    • If the version number isn't 11, download and install the update again.