As I can't solve the problem of calibration. I took decision to use PhD2 instead of internal guider. I will wait for some version that could fix the problem.
Until there I will check the evolution of Ekos/INDI each time the sky allow me to do.
But I am quite sure that there is something broken somewhere in the process of calibration for ioptron mounts in Ekos.
I believe that if PHD2 works fine that might means that the driver is nor responsible of the problem.

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