How to update firmware for PFX with dual GA plugs or LEMO (panel power):

1. Download the zipped application file named “ZPFX_DFU_GA_MAC_M116_D114.dmg” to your computer. You will see an alert that reads “We’re sorry, this file type is not currently supported” but the Download button works fine.
2. Double-click on “ZPFX_DFU_GA_MAC_M116_D114.dmg” to open the file. You will find the application file named “ZPFX_DFU_MAC_116_114.app.” If you are using Google Chrome as an internet browser you may see this message displayed: “.zip is not commonly downloaded and could be dangerous.” You must click on the arrow and select “keep” in order to download the file.
3. Remove the batteries from the PFX CPU. (Skip this step if your headset is panel-powered.)
4. Connect the headset to an Apple computer via the supplied USB cable. The micro USB port is located on the CPU: the port for battery-operated headsets is under the battery door; On the LEMO (panel-powered) headsets, it is visible on the back of the CPU, under the rubber cap.
5. Open the application named “ZPFX_DFU_MAC_116_114.app.”
6. Check the box to agree with the End User Licensing Agreement.
7. Click “OK” to proceed.
8. Click “Install Update” to install the software.
9. Click “OK” on the warning dialog box.
10. Observe that the status update bar is in progress.
11. Wait for the “Firmware Upgrade Successful” dialog box to appear. DO NOT UNPLUG THE USB CABLE.Note: If you are running a virtual machine or Windows/Mac parallel you may see a failure message at the end of the firmware update. If this happens, close the application, disconnect the USB cable from the CPU and reconnect it, then reopen the application and begin again with step 6.
12. Click “OK” on the “Firmware Upgrade Successful” dialog box.
13. Observe changes in the headset firmware version numbers.
14. Quit application.
15. Unplug USB cable and replace batteries.
16. Test headset for normal operation:

• Put the headset on your head.
• Power on the headset.
• Press and hold the Action button until acoustic response mapping is activated. (See your user guide to locate all buttons.)
• Wait a full 30 seconds.
• Power off headset.

IMPORTANT: The new Streaming Quiet™ Capture feature will not work in a quiet environment. Use only in a noisy environment, such as inside an aircraft with the engine running.