The changelog is available on Victron Professional, in the Firmware → Venus OS directory.
This section provides detailed release notes, version history, and firmware files for each Venus OS version.
To access Victron Professional, you need to sign up for an account. Registration is free.
If you do not yet have access:
Click Sign up
Fill in your details and confirm your email address
Once registered and logged in, navigate to the Firmware section, then open the Venus OS directory to view the changelog and download the relevant files.
There are two ways to update the firmware:
Via the internet - Update manually or enable automatic daily update checks.
Using a microSD card or USB stick - Download the firmware file, copy it to the storage device, and install it via the GX device menu.
On GX devices without a display (ie. a Venus GX or Cerbo GX without GX Touch), use Remote Console to access the menus described below.
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Note
For most systems, we recommend leaving automatic updates disabled (which is also the factory default). Instead, perform updates during scheduled maintenance, ideally when qualified personnel are on-site to revert changes or troubleshoot if needed.
Updating with a microSD-card or USB-stick is called 'Offline updating'. Use it when updating a device that is not connected to the internet.
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There are two ways to revert to an earlier firmware version:
Using the Stored firmware backup feature - This allows you to restore the previously installed version directly from the device.
Manual installation via SD/USB - Download the required firmware file, copy it to a microSD card or USB stick, and install it via Settings → Firmware → Install from SD/USB.
This feature allows you to switch between the current and previous firmware version without requiring internet or SD-card access.
To revert using the stored backup:
The system will now boot the stored firmware, and the current version will be saved as the new backup. |  |
In some cases, it may be necessary to manually install a specific firmware version, such as an older version that is no longer available under Stored backup firmware on the GX device. This section explains how to perform a manual firmware installation using a USB stick or microSD card.
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Note
While backporting to older firmware versions is generally supported, some settings may be reset to their default values during the process. Please double-check your configuration after installation.
In addition to the normal Venus OS firmware, it is also possible to install Venus OS Large, an extended build of Venus OS that adds Node-RED and Signal K Server.
Node-RED
Node-RED enables powerful customisation and automation. Key features include:
A fully customisable dashboard accessible via a web browser (locally or remotely via VRM)
Flexible logic flows, ideal for system automation, notifications, and visualisation
Signal K Server
Signal K Server is mainly intended for marine applications. It acts as a data multiplexer, supporting:
NMEA 0183, NMEA 2000, Signal K, and other data sources
All data from the GX device and connected systems is made available in Signal K for integration, processing, or display in external applications
Note: The additional features provided in Venus OS Large are not officially supported by Victron Energy. Use is at your own discretion.
Installation
On the GX device, go to: Settings → Firmware → Online updates → Image type
Select ‘Large’ to switch to Venus OS Large.
Proceed with the firmware update as described in this manual.
For further details and feature descriptions, refer to the documentation: Venus OS Large image: Signal K and Node-RED