Windows boot manager and hard drive disappeared after switching from Legacy to UEFI Bios

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MPJ77

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I have an issue when I change the Dell bios from Legacy to UEFI.I want to rebuild the system using DISM as we are doing mass deployments using network PXE boot.When I set Bios to UEFI boot manager does not show up and when I tried to add it, I get an error that the file system does not exist.So, I am not able to add the Windows Boot Manager.The hard drive also does not appear in the list which I assume is because it is windows 7 and not using GPT.After the image is applied and the system is rebooted it does not boot from the hard drive even though it has Win 11 install and it also has the UEFI

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