Need more information. Your laptop model, EFI version, error message or screenshot.

Same problem. Upgraded to Win 11 having open core installed, now it's ruined, upgrade process interrupted during reboot, now I have a reboot loop. Neither can revert to 10 or finish upgrade to 11 even after wiping opencore and replacing with stock windows manager.
TM1707

@Neolo Do you have specific error message for that? I will add windows11 crash information in README.

@Neolo Do you have specific error message for that? I will add windows11 crash information in README.

Windows 11 Upgrade went to 100% in WIndows Upgrade menu, asked to reboot, during reboot via Open COre it ran into BSOD FLTMGR.SYS, following reboot recycled 3 times, then it went into "Undoing upgrades...", then following reboot stuck in loop infinitely. OS is dead. None of those recovery options from ISO cmd are helping, spent entire day messing with dism, recreating UEFI partition etc. It's ruined.

@Neolo Sorry to hear about that. I don't have much idea about what's going on in your case since I never use Windows 11. You can go to https://www.insanelymac.com/forum/723-opencore/ or https://github.com/acidanthera/bugtracker/issues for help.

That was a dual boot with your efi from this github alongside with windows 10, which attempted to be upgraded to 11 with update manager.

@Neolo As this repository just uses OpenCore and kernel extensions instead of developing or changing them, problems with these products have to be reported to their developers for advanced support.

Maybe, you should have set LauncherOption=System and deleted item of bootstrap into UEFI entry list in order to succeed in getting a big upgrade for Windows.