Cable Matters released a firmware update tool for 8K HDMI Cables and Adapters. These updates resolve several compatibility and performance issues.

      This firmware update tool can also be used to update compatible products to enable 4K@120hz on macOS.

Applies to

This firmware update tool applies to the following Cable Matters products:

• USB C to 8K HDMI Adapter (201388)

• USB-C to 8K HDMI Cable (201362)

• [Designed for Surface] 48Gbps USB-C to HDMI Cable (201562)

• [Designed for Surface] USB-C to 8K HDMI Adapter (201588)

• USB-C to 8K HDMI Cable (201392)

Firmware Update Instructions

Note: To complete the firmware update, the Cable Matters adapter must be connected to the host and the monitor, with the monitor on and functioning.

1) Click Here to download the firmware update tool.

2) Unzip the firmware update tool, open the folder, and double-click to run the VMMUpdate application. 

3) Click Open Device to verify the Current FW version (this confirms the updater is functional). Select File to Flash, choose the latest firmware file in the pop-up window, and initiate the flashing process.

4)A completion prompt will appear once flashing is done. Disconnect the device from your computer, then reconnect it to activate the new firmware. Click Open Device again to confirm the updated FW version.

5) You may now enable 4K 120Hz support.

Firmware Update Troubleshooting and Notes

1. The macOS updater tool requires the device's current firmware to be the latest version; otherwise, the update will fail. 
2. There could be some unforeseen compatibility issues after flashing the custom macOS firmware.
3. After performing the macOS update, the adapter may be limited to 1080p with some Windows computers.
4. To ensure that you have the best experience while using the macOS firmware, please be sure to have the latest macOS version installed on your Mac device.
5. The macOS firmware is compatible with all M1/M2/M3 Macs including MacBook Pro, Mac Mini, MacBook Air, etc. Most Intel-based MacBooks can only output 4K@60hz with this firmware.
6. The MacBook Pro 2019 will output 4K@120hz with this firmware [excluding 201310], but there is sometimes a sound output issue.
7. Please revert to the regular firmware if the custom macOS firmware causes any problems.
8. If an error message appears when first starting the 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.