The current version of Sync-One2 firmware is v2.3.1.

This is the standard installation from serial number A22F7000 and higher.

The required software and update procedure may be downloaded using the buttons below. As a minimum, you will need

  • Instruction document
  • Firmware Updater Tool
  • Firmware file for Sync-One2
  • Depending on your Windows installation, you may also need the Microchip USB Serial driver, which you can download below. Generally, Windows 10 and above computers will automatically detect Sync-One2, but older versions may not and need the driver.

If the update stops partway through with Windows reporting the USB port type is unassigned, check that your anti-virus software has not blocked the port.

** NOTE: If you tried the update and it failed, and your Sync-One2 went into API control instead, read the instructions to see how to enter firmware update mode.

Release notes


Released 16 November 2023

Re-enable optimisations inadvertently omitted in v2.3.0.


Released 28 March 2023

Added Speaker Polarity testing feature.
Note this requires a specific test file available from the Test Files section of the Sync-One2 website.


Released 14 July 2022

Minor update to fix certain API commands.  This version is required when using the Python API control example.


Released 27 January 2022

Added checking to API START command to return an error if external audio is set but no external audio connection is present.


Released 15 October 2021

Fix to correct issue raised in V2.2.1 of auto shutoff not being suspend when the USB port is connected.

Added Auto Off trigger message to be displayed when the auto off timeout period expires.


Released 7 October 2021

Fix to support a manufacturer ‘enhancement’ to the OLED display module. Only affects serial numbers A22B3000 and higher.


Released 10 August 2021

Added API calls for setting the audio and video trigger levels, as requested by Dolby.  Additional API commands were also added for statistics management.


Released 5 April 2020

Addition of Extended mode enabling sync errors of up to +/- 3000ms (+/- 3 seconds) to be measured.  Requested addition by Hisense to assist during new product development.

Increased maximum frame rate calculations from 99 to 120.


Released 18 February 2019

Fix to enable custom splash messages with special characters rather than just alphanumeric characters.


Released 12 September 2018

Fix the video calibration and detection algorithm to correct performance in low light facilities, e.g. post production facility with large projection based final display.  Thanks to Goldcrest in Soho, London, for access to their Dolby ATMOS Post Production facility to help with testing, and HHB.


Internal release for field testing.


Initial release of Sync-One2 v2.

Firmware version numbers

The firmware version number is broken down into three sections of…

major . minor . patch

A major version is accompanied by significant new features and/or a change in the underlying hardware.

A minor version adds new features, either as part of the development plan or a customer requested feature.

A patch update is a solution opportunity to correct an unrequested feature – or a bug fix.

Customer specific customisation requests can be made if there is something you need for your environment.  These can be rolled into the main firmware but only activated, on a permanent basis, by using a feature code via API interface on a per serial number basis.