Issues with Latitude E7250 & SCCM 2012 R2 (no network in WinPE)

Hi!

We have a weird issue here.
I have added the new WinPE 5.x drivers to SCCM, added to boot image etc.
Also added E7250 drivers and created driver package, added to task sequence.
This has worked for all models from E4200 up to E7240.
E7250 on the other hand does not have functional network in WinPE.

Does anyone have any good information about this, or is the Dell WinPE 5.x driver cab broken?

-J