Thank you very much for your response and help!

I have to admit that your answer gives me some more reading as I don't really understand yet what the cdc_mbim driver or mbim is or does.

Anyhow, in the file /etc/usb_modeswitch.conf I set
DisableMBIMGlobal=1

and now the modem is working fine (in ...

Since the other threads regarding that modem did not reflect my problem I start a new here:

I am trying to get my E3372 working, however I do not succeed switching to modem mode.
When plugged in the cyan light is on, and network manager shows that the modem would be connected, though I cannot send ...