# Synaptics Prometheus

## Introduction

This plugin can flash the firmware on the Synaptics Prometheus fingerprint readers.

## Firmware Format

The daemon will decompress the cabinet archive and extract a firmware blob in
an unspecified binary file format. The binary file has a vendor-specific header
that is used when flashing the image.

This plugin supports the following protocol ID:

* com.synaptics.prometheus

## GUID Generation

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

* `USB\VID_06CB&PID_00A9&REV_0001`
* `USB\VID_06CB&PID_00A9`
* `USB\VID_06CB&PID_00A9-cfg`
* `USB\VID_06CB&PID_00A9&CFG1_3483&CFG2_500`

## Update Behavior

The device usually presents in runtime mode, but on detach re-enumerates with
the same USB PID in an unlocked mode. On attach the device again re-enumerates
back to the runtime locked mode.

## Vendor ID Security

The vendor ID is set from the USB vendor, in this instance set to `USB:0x06CB`

## External Interface Access

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