W520 no PXE-Boot when using UEFI only

Hello!
When I switch my W520 to UEFI-only there is no LAN-Boot-Option any more. I disabled all other devices and only left PCI-LAN in Boot-Order but then my laptop shows me a empty Boot-Manager. I already searched google and all UEFI-Options but did not find any solution.
The UEFI-Version is 1.38 (the one from June 2012)...
Am I the only one who has this problem?! Did not find anything on google with the typical keywords...
Thanks!

schrotti12 wrote:
Can BIOS handle GPT-Partitions then? I have to install Windows in GPT-Mode to use uefi...
Yes.  Booting to GPT disk has nothing to do with PXE.

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