How to apply for after-sales service for your chuwi products

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Sir,
I bought a Chuwi HIBook 10 Pro dual operating system recently., and bought a corresponding Chuwi pen to work with it. The first thing I noted was that the Chuwi pen was not working with it either in windows or in android.
On investigation, I realized that in windows:

  1. Windows ink was not installed in the windows 10
  2. The system did not detect secondary display in windows, hence I cannot make use of the HDMI to connect to externel display.
  3. I cannot under android use the HDMI outlet also
  4. The system does not keep time settings. Under windows I have to manually set the time as it does not even synchronize time automatically. Under Andriod, it updates the time once there is internet connection.
    Can you help with solve these problems?

Thanks ,

Bukkiie