If anyone had the same problem:
As expected this command set the mount into a waiting state for the upload of a firmware.
I spent a month searching this firmware and Skywatcher itself couldn't help me.

Fortunately, after dozens of emails to dozens of telescope distributors, someone could give it to me.

If anyone needs send me a message

Also the upload does work without the hand controller.

A bit disappointed that Skywatcher doesn't put it on its website.

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