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Have you enabled PXE on the x86 boot image and made sure to attach that boot image to the deployed task sequence ?. Have you also distributed both architecture boot wims to the dp's ? Have you added the network driver for the surface pro 4 to the x86 boot image ?. How are you connecting the SP4 to the network, via the USB network cable or via the DOCK ?
Have you enabled PXE on the x86 boot image and made sure to attach that boot image to the deployed task sequence ?. - I am using x64 boot image
Have you also distributed both architecture boot wims to the dp's ? - YES
Have you added the network driver for the surface pro 4 to the x86 boot image ?. - When tried to inject the surface pro 3 driver to the boot image getting an error "Failed to inject a ConfigMgr driver into Mounted Wim File"
How are you connecting the SP4 to the network, via the USB network cable or via the DOCK ? - USB network cable