Installing macOS Monterey 12 on unsupported Mac Pro

 

Make sure to have Boot ROM 144.0.0.0 installed. If not please follow this guide: Installing macOS Mojave 10.14 and performing Mac Pro 5,1 Boot ROM update

 

We recommend macOS Monterey 12.2.1 since newer versions are problematic in native mode.

 

You need two USB sticks with a size of at least 16 GB. One will be used for Monterey-micropatcher, the other one for OpenCore Legacy Patcher.

 

macOS Monterery does not support standard 802.11n Wi-Fi module and Bluetooth 3.0 module inside Mac Pro, so if you need Wi-Fi or Bluetooth functional either stay on Big Sur or older macOS version or replace old modules with a newer 802.11ac Wi-Fi and Bluetooth 4.0 modules.

 

Step 1

Download macOS Monterey 12.2.1 directly from Apple http://swcdn.apple.com/content/downloads/11/62/002-66265-A_HKQGKQG1Z4/orfaxf4k2gvqeatuhx6agnr5nlti3rwq93/InstallAssistant.pkg

 

Upon downloading install it like a normal application. As a result you will get an icon Install macOS Monterey inside Applications folder.

Installing macOS Monterey 11 on unsupported Mac Pro
 
 

Step 2

Insert the first USB stick to any USB port. It must be at least 16 GB in size.

 

From Finder menu click Go, then Utilites and double click Disk utility icon.

 

Select your USB stick from the left menu and click Erase button.

 

Type MyVolume in name field and select Mac OS Extended (Journaled) as format and GUID Partition Map as scheme. Then click Erase button to erase USB stick.

 

If you can't see Scheme field, click the View widget in the upper left corner of the Disk Utility window and choose Show All Devices. Now you should see your drive device descriptions with the drive name nested underneath. Select the drive description just above the drive name for the device you want to format. After that you will see Scheme in Erase window.

Installing macOS Monterey 11 on unsupported Mac Pro

 

 

Step 3

Visit https://github.com/alphascorp/Monterey-micropatcher and click Code button then Download ZIP link.

 

The downloaded file should be automatically unpacked inside Downloads folder.

Installing macOS Monterey 11 on unsupported Mac Pro
 
 

Step 4

In Finder choose Go, then Utilites and double-click Terminal icon to launch Terminal.

Installing macOS Monterey 11 on unsupported Mac Pro
 
 

Step 5

Create bootable USB installer by typing a following command (all in one line), then press ENTER:

 

sudo /Applications/Install\ macOS\ Monterey.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume

 

Terminal will ask for password. Type your user password and press ENTER (password won't be shown not even under asterisk).

 

Creating bootable USB installer will take about 15-50 minutes depending on USB stick write speed.

Installing macOS Monterey 11 on unsupported Mac Pro
 
 

Step 6

As soon creating bootable USB installer is finished type another commands in Terminal to patch it and press ENTER after each of these (every command in one line):

 

cd Downloads/Monterey-micropatcher-main

 

./micropatcher.sh

Installing macOS Monterey 11 on unsupported Mac Pro
 
 

Step 7

Finally enter such command and press ENTER (all in one line):

 

./install-setvars.sh

 

Terminal will ask for users password (it won't be shown not even under asterisk).

 

Your first USB stick is now patched.

 

You can now safely remove it from the computer, but it will be needed later.

Installing macOS Monterey 11 on unsupported Mac Pro
 
 

Step 8

Insert second USB stick and redo steps 4-5 to create another bootable Monterey USB stick.

 

Download https://github.com/dortania/OpenCore-Legacy-Patcher/releases/download/0.3.3/OpenCore-Patcher-GUI.app.zip file.

 

The downloaded file should be automatically unpacked inside Downloads folder.

 

Go to Downloads folder, right click on OpenCore Patcher file and choose Open.

Installing macOS Monterey 11 on unsupported Mac Pro
 
 

Step 9

Click Open button to run OpenCore Legacy Patcher.

Installing macOS Monterey 11 on unsupported Mac Pro
 
 

Step 10

Upon launching OpenCore Legacy Patcher, click Settings icon and check Disable System Integrity Protection, Disable SecureBootModel and NVMe boot.

Installing macOS Monterey 11 on unsupported Mac Pro
 
 

Step 11

Click Build and Install OpenCore, then select your USB stick and click Continue button.

Installing macOS Monterey 11 on unsupported Mac Pro

 

 

Step 12

Enter your username password and click OK button to start patching.

Installing macOS Monterey 11 on unsupported Mac Pro

 

 

Step 13

Finally click Quit button.

Installing macOS Monterey 11 on unsupported Mac Pro

 

 

Step 14

Reboot your computer.

 

Press and hold Option key (on Mac keyboard) or ALT key (on Windows keyboard) and click an arrow under EFI boot icon.

 

Computer will launch OpenCore picker.

Installing macOS Monterey 11 on unsupported Mac Pro
 
 

Step 15

This time click an arrow under Install macOS Monterey to start macOS Monterey installer.

Installing macOS Monterey 11 on unsupported Mac Pro
 
 

Step 16

If you haven't created blank APFS partition needed for macOS Monterey yet, you can create one now by choosing Disk Utility.

Installing macOS Monterey 11 on unsupported Mac Pro
 
 

Step 17

If you have APFS partition ready, you can select Install macOS Monterey and click Continue button to start the installation.

 

Continue macOS installation just like on a supported Mac. The system will reboot several times automatically during installation.

Installing macOS Monterey 11 on unsupported Mac Pro
 
 

Step 18

When installation is ready you will be presented with Migration Assistant. Leave the default radio button as is and just click Continue button.

Installing macOS Monterey 11 on unsupported Mac Pro

 

 

Step 19

Now you can move data from your old macOS installation. Click your previous macOS drive and then Continue button.

Installing macOS Monterey 11 on unsupported Mac Pro

 

 

Step 20

As soon your data is moved you will see macOS Monterey desktop, you need to remove your second OpenCore USB stick and insert the first USB stick contaning Monterey-micropatacher.

 

Reboot the system.

 

Press and hold Option key (on Mac keyboard) or ALT key (on Windows keyboard) to see boot picker and click an arrow below EFI boot icon.

 

Computer will be turned off automatically. This will set all proper NVRAM values needed for macOS Monterey. You can now safely remove first USB stick as well.

 

WARNING: If you would ever reset NVRAM or you have no entry sign then you need to redo this step to be able to boot macOS Monterey.

Installing macOS Monterey 11 on unsupported Mac Pro

 

 

Step 21

Power on the computer.


Once again press and hold Option key (on Mac keyboard) or ALT key (on Windows keyboard) to see boot picker, then click an arrow under MONTEREY (or other name you've choosed) to boot macOS Monterey. Enjoy!

 

You can choose the default Startup disk by clicking Apple logo from Finder menu, then choosing System preferences and clicking Startup disk icon.

 

If you use NVIDIA Kepler based graphics card (GTX600/GTX700 series or Quadro K series) post installation you also need to install GeForce Kepler patcher: Installing GeForce Kepler patcher for NVIDIA GeForce GTX600/GTX700 and Quadro K series cards under macOS Monterey 12.0.1 or later

Installing macOS Monterey 11 on unsupported Mac Pro