---
title: "Update sensor firmware"
canonical: "https://help.vicon.com/space/IMU/73127173/Update%20sensor%20firmware"
format: markdown
---
Capture.U Desktop enables you to upgrade your Blue Trident sensors to the latest firmware

> ❌ **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.


**To update sensor firmware:**

1. If your sensors aren't plugged in, connect them to the computer (see [Connect sensors to Capture.U Desktop](https://vicon-help.atlassian.net/wiki/spaces/IMU/pages/73121980)) and launch Capture.U Desktop.  
To let you know that firmware needs to be upgraded, the Sensors icon displays a red circle at the top right.
2. Click **Sensors** on the left.
  On the **Sensors** tab, the connected sensors display a red circle at the top left of each connected sensor display and Capture.U Desktop informs you that the connected sensor(s) require a firmware upgrade.
3. Follow the onscreen instructions by restarting each sensor, one at a time, holding down the button on the sensor's cradle for 10 seconds.   
The status changes to **Waiting for sensor to restart for firmware update** and then **Firmware update in progress**, ending with a **Success!** status and a final reboot of the sensor.  
:check_mark: **Tip**: Holding down the button causes the sensor to enter bootloader mode (see [Understand Vicon IMU sensor status](https://vicon-help.atlassian.net/wiki/spaces/IMU/pages/73142668)).
4. When the firmware has finished updating, you can expand the displayed information to view the updated firmware number on the **Sensors** tab.
5. If other sensors need to have their firmware upgraded, repeat the above steps for each one.
6. You can now download trials that were captured in **To Sensor** mode (see [Download a trial from the sensors](https://vicon-help.atlassian.net/wiki/spaces/IMU/pages/73134174) and [Capture to sensor](https://vicon-help.atlassian.net/wiki/spaces/IMU/pages/73133790)).

> ✅ **Tip**  
> ✅ If one or more sensors fails to upgrade, try disconnecting the sensor(s) from the computer and entering bootloader mode. To do this, hold down the USB adapter button on the sensor for at least 10 seconds. Release the button and wait 60 seconds for the sensor to exit bootloader mode, then reconnect and relaunch Capture.U Desktop. Retry upgrading the firmware as described above.

> Macro (scroll-pagebreak)

## Load updated firmware (10.#) to upgrade Blue Trident sensors

If new Blue Trident sensor firmware becomes available (that is, firmware later than 10.0.1), add this file to Capture.U Desktop either by clicking or dropping the firmware file onto the **Sensors** tab.

![image](media://6e7910fa-5079-4397-b897-44fe1b37212c)

To revert back to 10.0.1 firmware, remove the added firmware file by deleting the firmware file located in:

*C:\Users\* Username *\AppData\Roaming\Capture.UDesktop\firmware*