How to Update Cabletime’s USB C to HDMI Adapter for Nintendo Switch 2 (Firmware Fix for Version 21.0.0)

Nintendo recently released the Switch 2 System Update — Version 21.0.0, and many players reported a serious problem: most third-party docks and USB-C to HDMI adapters stopped working entirely.

Users confirm many 3rd-party docks can now charge the Switch 2 but no longer output video to the TV or monitor.

This means the issue is not washed-out colors or HDR problems — it is a complete “NO DISPLAY / NO SIGNAL” failure

Why Third-Party Docks Stopped Working

With Version 21.0.0, Nintendo introduced updated video-output handshake rules. This affects any dock, hub, or USB-C to HDMI adapter that uses older firmware, outdated DP-Alt-Mode communication, or a non-matching handshake.

As a result:

- The Switch 2 refuses to output video to many third-party docks

- Only basic power-only accessories work

- Some products work only after firmware updates

Cabletime Firmware Update — Fix Available Now

Cabletime has released updated firmware for the Cabletime 4K60Hz USB-C to HDMI Mini Dock Cable (with PD 100W).

Download Firmware:

https://drive.google.com/drive/folders/1xvV0zBqEmltID31wcsP2QKY4xOAoeGRO?usp=drive_link

How to Update the Firmware

1. Connect the PD port of the adapter to a Windows PC using a USB-A to USB-C or USB-C to USB-C cable.

2. Download the correct firmware (4K60Hz or 4K144Hz).

3. Open the folder and run the .exe update tool.

4. When the progress bar turns green, the update is complete.

5. Reconnect to your Switch 2 — video output should work normally.

What the Firmware Update Fixes

- Restores video output with Switch 2 Version 21.0.0

- Fixes “No Signal / No Display”

- Ensures correct DP-Alt-Mode communication

- Stabilizes 4K60Hz output

Support

If you still need help:

Email: support@cabletimetech.com

Summary

Switch 2 Update 21.0.0 broke compatibility with many third-party docks. Cabletime released a firmware fix, and after updating, the Cabletime Mini Dock Cable works normally again.