

Note that to format the disk with MBR partition scheme with Disk Utility you must select "View" and then select "Show All Devices." Then select the drive and click erase. Then reformat the disk during Windows setup. Note that instead of deleting partitions from within Windows setup you can alternatively format the disk in macOS using Disk Utility as MBR partition scheme and select the exFAT file format. User h9826790 has outlined instructions here. You can use one of the 3rd party programs I've listed below if you want to, but they require SIP (System Integrity Protection) to be at least partially disabled. The Boot Camp drive is selectable in Startup Disk in System Preferences in macOS and will boot properly when installed in Legacy BIOS mode. The latest Boot Camp 6.1 software allow you to select APFS macOS drives in the Boot Camp control panel in Windows.

Native solution: You can switch between macOS and Windows using Apple's utilities.
#Boot camp for mac switch to mac pro#
Therefore Windows should only be installed in Legacy BIOS mode on the Mac Pro (5,1 and older.) Detailed information on this issue can be found within the BootROM thread. Warning! : It has been discovered that Windows when installed in EFI mode is corrupting the Mac Pro’s firmware by signing it with multiple Secure Boot (X.509) certificates. It does not apply to a MacBook Pro, iMac, or any other Mac besides the classic Mac Pro, but users of those other Macs may still find some of the information in this thread useful. Notice: This thread only applies to the classic Mac Pro from 2009 to 2012 (4,1 & 5,1).
