I have no network connection with Windows 10 and when I try to install Windows 11 I get the message that TPM 2 is not supported. Can't be with a new motherboard.
Does anyone have a tip?

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Connect with lan cable and go to network troubleshooting then a connection is established then download the wlan drivers via windows update and then it works without lan cable.

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You have to download the current network card driver to a UBS stick and then load the driver on the UBS stick during the Win11 installation

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Alternatively, you can activate the TPM in the bios, after which the Windows 11 installation should work.
The driver for the LAN port probably needs to be installed for the port to work with Windows 10. Win 11 probably already has it. 
However, I also recommend a BIOS update and then loading the Bios defaults and restarting the setup.

Answer

You have to do a BIOS update, after that it will work

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Question about ASUS PRIME Z790-A WIFI

I have no network connection with Windows 10 and when I try to install Windows 11 I get the message that TPM 2 is not supported. Can't be with a new motherboard. Does anyone have a tip?