Mac Pro 5,1 boot issue

[David_ballard]

Hi all, apologies but a client of mine has bought a second hand 2010 5,1 Mac Pro and got me to install storage as it didn’t come with any so I installed a Nmve pice card with 4 Nvme slots I only installed 2 critical p2 drive 1tb the want to upgrade later and 2 2tb seagate barracuda desktop drive and when I went to bot into Mac OS recovery it won’t boot to that it just tries to boot to windows and then crashes any help also I know all the drives work and can boot both windows and macOS the computer has also successfully boot into windows ans macOS thanks 

[WhitetailAni]

MacPro5,1's can't boot to NVMe drives without a BootROM upgrade, have you done that yet?

https://forums.macrumors.com/threads/pcie-ssds-nvme-ahci.2146725/

Also, how exactly are you attempting to boot to Mac OS recovery? Via an onboard install of Mac OS or with a flash drive or CD/DVD?
If you're attempting to do it via the onboard install, I recommend not to. Make yourself a bootable USB with TransMac (on Windows) or with this guide from Apple (macOS):

https://support.apple.com/en-us/HT201372

The MacPro5,1 doesn't support anything past macOS Mojave natively, though patchers are available for Catalina and higher support. Note that Catalina and above have no 32-bit support for any applications.

[Lightwreather]

12 minutes ago, FakeKGB said:

though patchers are available for Catalina and higher support.

To expound on this a bit:

For Catalina, there's Dosdude1's patcher

And For Big Sur and beyond, there's OCLP

[David_ballard]

I am stupid i haven’t done the bootRom upgrade thanks why didn’t I think of that I will try later today when I get to work also how do I make a macOS install on a new MacBook M1 Mac for a different version like Mohjava my M1 Mac only supports big sur and Monterey