if you messed with uefi windows without OpenCore protection and the Mac Pro you prolly have now certificates in your boot rom. You can check it with binwalk and dosdude's romtool or with a tool I made. This can lead in the long run to malfunction of the nvram and a bricked machine.
Hi, thank you for your comment. SURE I does ROM backup by another older tool, but NOW I just done your-tool backup.
Anyway I had over years about 30+ MacPros different types a just never had problems to customize them for users from scratch in HW and SW. Sure before I had used Legacy Windows installs but newly with needs of rednering a use nVidia RTXes it is mut to have and use UEFI install with Windows. Now I had done 5 MacPros 4.1 flashed to 5.1 and real 5.1 without any bootloaders, but all of them are just directly used just for Windows10 or just for macOS. Just now I have real MacPro5.1 with need to dual boot into latest possible MONTEREY (Ventura no go due HW cpu limit) and DUALBOOT with Windows10. So thas why I used latest OCLP.
So fresh installation dones with OCLP Monterey on separated PCIe NVMe drive + handmade Win10 over VirtualBoX wich is to fast and easy, than just put to the machine (by this way is possible to have portable Windows10 on any PC/MAC on external drive). By this way Iam doinf Win installs often and its perfectli works.
After that putted into MP5.1, booted into OCLP Monterey and than choosed parmanet boot from WinDisk. To reboot back into macOS I just used NVRAM/PRAM reset 2x and was back... after that I updated Wins ans macOS and all worked fine.
And after I just started to make solution to "easy" rebbot between macOS Monterey and Win on sure UNSUPPORTED MP5.1 at that all of that ends here ...
NOW Iam unable to permanently choose WinDisk to rebot into windows. If I remove PCI NVMe macOS drive its booted into Windows perfectly, bute again I must redo install PCI NVMe drive and NVRAM reset 2x to again reboot to macOS.
And after and now Iam unable to reboot back into Windows.
Iam attaching screenshot ROM DUMP from yor APP and look OK only one for me is "annoted" "oldbootblock of "??" but ist maybe just some of "translation"...
So Iam sure that all of my installation of macOS and Windows10 100% works and are okay.
Pleas can you help me HOW TO EASY create some setup for normal user to be able to easy reboot between macOS and Win10 in my instance (?)
P.S.: All known tools not works as BLESS, GRUB, rEFInd, BootManager, NextBoot, MyBootManager ....