If a firmware update fails, redo the firmware update through USB using the firmware update application for macOS or Windows. The update application can be downloaded under My Profoto. Open the application and follow the 5 steps below:
- Turn off the unit
- Remove the battery/cord
- Press down the left dial while connecting the USB cable
- Start the update and wait until it is finished before removing the USB cable
- Attach the battery/cord and restart the unit
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