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---
title: Plugin: Algoltek USB
---
## Introduction
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:
* `tw.com.algoltek.usb`
## GUID Generation
These devices use the standard USB DeviceInstanceId values, e.g.
* `USB\VID_25A4&PID_9311`
* `USB\VID_25A4&PID_9312`
* `USB\VID_25A4&PID_9313`
* `USB\VID_25A4&PID_9411`
* `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.
## Quirk Use
This plugin uses the following plugin-specific quirks:
### `Flags=ers-skip-first-sector`
Skip erasing the first sector, needed for AG9411 and AG9421 products.
Since: 2.0.2
## 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`.
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