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PXE works with Legacy but not UEFI

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I have SCCM deploying Windows 8.1 via a task sequence using x64 boot image but it only works when i set BIOS to legacy.

This is an issue as we have some newer PCs which use TPM 2.0 and require UEFI. When i change bios to UEFI, i cannot PXE boot. I get the message 'Start PXE over ipv4' then it moves onto 'Start PXE over ipv6', but never actually PXE boots and just loops.

Can anyone help?

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As far as I remember Uefi boot does not work when you have DHCP options configured, it didn't on the DP locations that I had configured DHCP options on.

Remove them and try the boot then. You would need to use IP helpers instead.

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