[doublepost=1555516314][/doublepost]No, I have never run Windows on any of my Macs. Ever! So, am I ok then? No repair needed?Did you ever run Windows with your Mac Pro? Long story short, MP51.0087.B00 not having microcodes and Windows SecureBoot system makes havoc in the NVRAM part of the BootROM - a lot of Mac Pros bricked with this combo.
If you ever use Windows 10 with your Mac Pro while on MP51.0087.B00, additional steps are needed to repair the BootROM.
Thanks
/yeshe