Yoga 700-11isk Windows 10 update - no more sound

[friedrich-eugen]

Hello,

it is a little bit annoying...
... My daughter has gone to Sydney, to have a terme there during her master-studies... and she took our travel-NB along, a Yoga 700-11isk (Core M i7, 8GBmemory, 1TB SSD, Windows 10 1903pro. Office etc etc...) She is going to have video-driven courses, as far as I understand... I.e. she needs to have audio output...

BUT: Some days ago, after one of several Windows Updates audio-output has stopped. Windows Updates "hang", will not execute, too.
It should not be a problem of using a european MS-Installation in an ex-european/english-speaking/australian environment, should it?
It should not be connnected to the Lenovo-tweaked Intel Graphics-driver (515-chip), should it?

• No change after uninstalling / reinstalling audio-drivers (two are indicated:(1)intel audio-display(?, installed itself unasked) and (2) Realtek)

• No change after changing setup (virtual system on/off

Anyone similar experiences,similar behavior with similar systems (Yoga 3-11. Helix 2ndG)