Knowledge Base for Cable Matters Connectivity Products

Cable Matters 48Gbps HDMI Video Adapter (201428) – Firmware Update to Fix Compatibility and Performance Issues

Article ID: 159
Last updated: 29 Sep, 2022

Cable Matters released a firmware update for its 48Gbps USB C to HDMI Adapter with 100W PD. This update resolves several compatibility and performance issues. Follow the instructions below to update the device firmware.

Applies to

This firmware update applies to the following Cable Matters products:

Resolved Issues

This firmware update resolves the following issues:

  • Doesn't support the DDC/CI function with Dell Monitors
  • Only supports up to 2Lane HBR3 at the upstream end on some VMM7100 4Lane HBR3 Products (Only supports 4K@30Hz on some Mac Devices)

Firmware Update Instructions

1) Connect the adapter to a free port on a computer or laptop. Then connect a display to the adapter or cable's HDMI port. If you are using a laptop, connect an AC adapter to the laptop. 

2) Click here to download the firmware update tool.

3) Unzip the firmware update tool and launch the “VmmDPTool.exe” program. If a prompt asks to run the program as an Administrator, click yes.

4) In the Debug tab, click the “FW version” button. The “Status” textbox should populate with information about the adapter. Check that the “Firmware version” field is less than  7.02.120.”

5) Click the “FLASH” tab, then click the “Load to FLASH” button. In the file open dialog, select the firmware file and click “Open.”

6) If a dialog box appears stating the Product ID did not match, click Yes to proceed with the firmware update.

7) Wait for the firmware update process to finish. When the firmware update process finishes, disconnect and reconnect the adapter from the computer. Verify the firmware update by clicking the “FW version” button and checking that the new firmware version is installed.

Firmware Update Troubleshooting

  • If an error message appears when first starting the VmmDPTool.exe program, ensure the program is running as an Administrator and check that the video adapter is connected to a display and the host computer’s video port.
  • If a dialog box appears stating the Product ID did not match, click Yes to proceed with the firmware update.

Article ID: 159
Last updated: 29 Sep, 2022
Revision: 5
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