Hi Connor,
The "PXE-E53" error indicates that the PXE client received a reply to its DHCPDISCOVER message, but the "boot filename" information was missing in this reply. Make sure that the "boot filename" option is present on your DHCP server, and that its value is set to the filename of the boot loader.
When using DHCP Options for PXE Boot, Option 66 must be the IP-address of your WDS server, Option 67 must be pointing to "SMSBoot\x86\wdsnbp.com". When using IP-helpers you need to enter the IP-address of your WDS server only.
Option 67 for the name is like this
For legacy bios x86 SMSBoot\x86\wdsnbp.com
For legacy bios x64 SMSBoot\x64\wdsnbp.com
For UEFI x86 SMSBoot\x86\wdsmgfw.efi
For UEFI x64 SMSBoot\x64\wdsmgfw.efi
The option 60 is by default the value should be: PXEClient
Option 66 is the FQDN of the pxe server.
If you plan on booting UEFI you will only be able to boot UEFI with this option. And with the legacy bios you can use For legacy bios x86 SMSBoot\x86\wdsnbp.com to boot both X64 and X86
But please look into using Ip-helper and not forcing those option they are wonky at best and Microsoft strongly suggest using Ip-helper as well.
A similar case
https://www.dell.com/community/Laptops-General-Read-Only/PXE-E53-No-boot-filename-received-after-Dell-update/m-p/5048450#M899836
Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.
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