How To | Updating K.2 Series Firmware

Learn how to easily update your K.2 Series firmware and ensure your system is running smoothly for optimal performance.

Updated at August 11th, 2025

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Procedure

QSC remains committed to the quality and reliability of our products and services and to the satisfaction of our customers. 

Update your K.2 Series active loudspeaker firmware for the best performance and to safeguard against service interruption. 

Firmware Check

  1. Turn on the loudspeaker.
  2. On the configuration display menu, select SETTINGS to see what firmware version is installed.
    1. Make sure the latest version available from the K.2 Firmware page on the QSC website is displayed.
    2. If not, proceed with the firmware update. 
 
 

Download / Install

Please make sure to allow plenty of time prior to your next event before attempting to perform the following update.

  • Download the Windows or macOS updater from the K.2 Firmware page on the QSC website.
    • Windows Installer: K2Updater-2.2.6-windows-x64-installer.exe
    • macOS Installer: K2Updater-2.2.6-macOS-universal-Installer.dmg

Windows Installation

  1. Uninstall and delete any previous versions of the K.2 Updater App.
  2. Once downloaded, use a Windows extraction tool WinRAR or a similar application to extract the .zip file.
  3. Navigate to K2Updater-2.2.6-windows-x64-installer.exe
  4. Double click the installer icon.
  5. Click Next on the welcome page.
  6. Mark I Accept the Agreement and then click Next.
  7. Define the installation directory location click Next. 

    Note

    The default directory is C:\Program Files\QSC\K2 Updater.

     
  8. Click Next to begin the installation.
  9. Click Finish once the installation is complete.

    Note

    The K2 Updater App will now be listed in the App list within the Start Menu alphabetically by K.

     
 
 

macOS Installation

  1. Uninstall and delete any previous versions of the K.2 Updater App.
  2. Once downloaded, right-click and select Open with Archive Utility to extract the compressed file.
  3. Double-Click to open K2Updater-2.2.6-macOS-universal-Installer.dmg
  4. Double-Click K2Updater-2.2.6-macOS-universal-Installer to install the K.2 Updater app.
  5. Enter the Admin Password to initiate the install
  6. Click Next on the Welcome Window of the K.2 Updater App
  7. Mark I Accept the Agreement and then click Next.
  8. Define the installation directory location click Next.

    Note

    The default directory is /Applications/QSC/K2 Updater.

     
  9. Click Next to begin the installation.
  10. Click Finish once the installation is complete.

    Note

    The K2 Updater App will now be listed in the Applications list within Go dropdown menu.

     
 
 
 
 

Update Firmware

Warning

This update procedure may take up to 15 minutes to complete. There are two stages within the update process. Once you start the update, you must let it continue without interruption to avoid corrupting the firmware and preventing the loudspeaker from turning on. During the update, do not disconnect the USB cable and do not turn off the loudspeaker. 

 
  1. Start with the amplifier module turned off. On the computer, open the K2Updater application. 
  2. Use a flat tool to carefully pry the knob off the rotary encoder on the loudspeaker’s amplifier module. You will see a micro USB port next to the rotary encoder.
  3. Plug a USB-to-micro USB cable into the port and plug the other end into an available USB port on the computer. 

    Note

    The USB cable must be capable of transferring data. Cables used exclusively for charging (with non-functional DATA pins) will not work. To reduce the chance of error, do not update multiple loudspeakers simultaneously using a USB hub.

     
  4. Turn the amplifier module on. The K2Updater application discovers the K.2 model connected to the computer and displays it in a table.
  5. Click Update to start the process.
  6. Watch the progress bars in both the K2Updater application and on the loudspeaker’s display screen as the new firmware is transferred from the computer to the loudspeaker.
  7. After the firmware has loaded into the internal memory, the loudspeaker amplifier module writes it into permanent storage. Do not interrupt this process.

    Important

    In some instances where a speaker was updated from early builds of firmware, it has been observed that the speaker may display firmware 0.67.77.0086 first before cycling and restarting the update process again. DO NOT stop the update process if this is the case.  Allow the speaker to fully complete the second cycle.

     
  8. When the update is complete, the message ‘Firmware up to date’ appears.
  9. Turn off the loudspeaker and disconnect the USB-micro USB cable.
  10. Press the knob back onto the rotary encoder shaft.
  11. Turn the loudspeaker on. Booting up will take a few seconds.
  12. Follow the instructions in the Firmware check section to verify that the display shows the correct model number and the new firmware version. 

The update is complete and the loudspeaker is ready to use again. 

 
 

Troubleshooting

If the update did not complete during the loading process for example, if the progress bar froze before loading was completed, try the steps below:

  1. Turn the loudspeaker off for a couple seconds and then on again.
  2. Then, click Update in the K2Updater application once it recognizes the loudspeaker again.

    Warning

    Never shut off the loudspeaker when the display indicates WRITING FIRMWARE.

     
 
 
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