What you can do is to disable the bootagent.
Download preboot.exe which contain the bootutil.exe utility.
Create a bootable dos flash drive
Copy bootutil.exe in the drive
Boot from the drive to enter into dos mode,
execute the command bootutil -FD to disable the bootagent
To disable the flash firmware on all the network adapters.
BootUtil -ALL -FD
You may refer more info on these websites
hope this helps.
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Thank you for your reply.
I solved the problem with the BIOS \ boot \ Boot PXE LAN ds = Disabled