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  1. Reboot the charger.
  2. Connect the Bluetooth app to the charger. The charger serial number should go green when connected. (If you get E1 communication error, try to keep the phone closer to the charger.)
  3. Wait until the app gives you message about the update and the charger lights will go red.
  4. Proceed with the update. Charger lights will go to yellow.
  5. Keep your phone as close as possible to the charger and don't do not do anything with the phone at the same time as it is updating and ensure that the phone does not turn off.
  6. Wait until the bar has finished and after some time the charger will shut down.
  7. Wait for the charger to turn on again with yellow lights.
  8. Now you can reboot the charger and close the app.
  9. Wait until the charger goes to first green and after some time it goes to red.
  10. When it goes back to green then it is updated.
  11. Now you can check the firmware version with the app.