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Welcome to the Techiepedia Group.
In order to assist you on this, you may need to try a few things and answer to these questions below:
1. Have you checked if the lan is enabled in the BIOS? (Advanced>> Peripheral Configuration >> On-Board Lan)
2. Try to enable Boot to Network in the bios as a test to see if you do get the options
3. Which OS are you using?
4. Try the latest drivers Link
5. You can try the tools that is available when you download the above driver.
Extract the downloaded file using Winrar
Go to folder PROWin32\APPS\TOOLS
Copy these tools to a dos bootable usb and try them
All the best,