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How to upgrade Digital Sign Client app on the Desk Booking Screen WS-0350



  • Get the .APK file from maintenance.add-on.com
  • Copy the APK file to a USB pen
  • Plugin the USB pen into the Micro USB port (an adapter must be necessary)
  • Exit the Digital Sign Client app 
  • From the (firmware) menu interface select Open File app
  • Select USB drive
  • Tab on the APK file and the installation will start
  • After finishing the upgrade then restart the device


Choose files or drag and drop files