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If you choose to write in English, please do not apologize for doing so poorly, as it is unnecessary. We understand and will ask for clarification if needed.
So WiFi doesn’t work and ethernet is also not working, correct? It is likely some incompatibility issue with the network card of your device.
On this other discussion a user also has a broadcom, maybe it can help:
If that doesn’t work and nobody else is able to provide much more help, perhaps the solution is to get an alternative network card.
Edit: @ibiri as a side-note 4GB of RAM may not be enought. I’ve created a discussion topic for this here: Is 4GB of RAM enought for running Qubes OS?.
Edit 2: forgot to mention. I’ve edited the title to make it more specific.