Second Dock does not update and charge

I had ordered with the Remote 3 two Docks 3.
I have tested first the Remote 3 with one Dock 3.
Now I have setup everything and all integrations are running I have unpacked the second Dock 3.

The first Dock 3 I use as receiver and is positioned close to the TV, soundbar, setup box and Blu Ray player.
This Dock is connected with the power USB-C cable, an Ethernet cable and the IR blaster.

The second Dock 3 I want to use as charger for the Remote 3 close to my chair from which I look TV.
This Dock is only connected with the power USB-C cable and WiFi.

I have added the second Dock successfully in the Web Configurator, but it has two problems.

  1. It is running the original older firmware version: 0.6.2-dev.9+7f82722b.dirty and wants to update this to the newer firmware version 0.7.1.
    But everytime when I do the update the progress bar runs till almost the end and the gives the following error message:
    Update could not be completed. Please try again later.
    There was an error during installing the update.

  2. I want to use this Dock as the charger of my Remote 3, but when I put the Remote 3 in this Dock the display tells CHG OFF with a number mA.
    This number change everytime I restart the Dock by unplug and plug the power cable.

I have tried to switch the Docks and the power units, without success.

The first Dock works well, has the latest firmware and does charge, but the second Dock will not update and not charge.

Please could you help me how to solve these two problems?