---
title: "Update IMU firmware"
canonical: "https://help.vicon.com/space/IMU/73111902/Update%20IMU%20firmware"
format: markdown
---
If you need to upgrade the firmware for your Blue Trident sensors, when you start Capture.U the sensors are displayed with a yellow warning symbol, and a message warns you that an update is needed:

![image](media://bbdb95ad-04bb-4d33-928a-5a16115a87b4)

> Macro (scroll-pagebreak)


    **To open Capture.U Desktop and update firmware:**


1. Do one of the following:
  - To directly open Capture.U Desktop, tap **Get Desktop App**.  
or
  - To close the message first, tap ** OK **and then open Capture.U Desktop.
2. Upgrade the sensor firmware with Capture.U Desktop (see [Update sensor firmware](https://vicon-help.atlassian.net/wiki/spaces/IMU/pages/73127173)).

> ❌ **Downgrading sensor firmware**
> ❌         
> ❌ 
> ❌ - If you're using second-generation Blue Trident sensors, **do not downgrade your firmware**, even if prompted to do so by Capture.U Desktop.
> ❌ - If you have first-generation Blue Trident sensors, you can safely downgrade their firmware, if necessary. However, as Capture.U 1.3.1 Desktop is not compatible with firmware earlier than 10.#, if you downgrade the firmware from version 10, you must uninstall Capture.U 1.3.1 and use an earlier version of Capture.U.