Plugin: Algoltek USB


This plugin supports the firmware upgrade of DisplayPort over USB-C to HDMI converter provided by Algoltek, Inc. These DisplayPort over USB-C to HDMI converters can be updated through multiple interfaces, but this plugin is only designed for the USB interface.

Firmware Format

The daemon will decompress the cabinet archive and extract a firmware blob in a packed binary file format.

This plugin supports the following protocol ID:


GUID Generation

These devices use the standard USB DeviceInstanceId values, e.g.

  • USB\VID_25A4&PID_9421

Update Behavior

The firmware is deployed when the device is in normal runtime mode, and the device will reset when the new firmware has been programmed.

Vendor ID Security

The vendor ID is set from the USB vendor, in this instance set to USB:0x25A4.

External Interface Access

This plugin requires read/write access to /dev/bus/usb.

Version Considerations

This plugin has been available since fwupd version 1.9.11.


Anyone can submit a pull request to modify this plugin, but the following people should be consulted before making major or functional changes:

Mason Lyu: MasonLyu