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I asked for EFI + ioreg, to start Win from OC you need Darwin fix in ACPI so you need everything I asked for.

Compress the video and attach it here Does your system have a discrete graphics card? if so, it might need to be disabled via SSDT patching. Post an IOReg file for better troubleshooting using IORegistryExplore.app v2.1, not 3.0+

All, I see this question raised a lot in various OSXL forums, so I thought I would add my experience. I just successfully set up my Latitude E7270 to dual boot Windows 10 and Big Sur partitions on the same drive under OpenCore 0.68. The original guide is from a post on reddit (Credit: u/junkieslip_6). Then, there is a very good you tube video that walks you through the steps from that guide. Two important notes: -It took me a few tries in Disk Utility to make sure I had a separate NTFS partition for Windows, and not another Volume in the same APFS container for MacOS -I needed to make my Windows 10 install USB using Rufus on a Windows 10 machine (neither Win 7 nor Linux/gparted worked for me) ...well three important notes: -there is a typo in the text instructions under the video on the you tube pages: "partition efi size=100" should be "create partition efi size=100" Hope this helps-