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cMP beginner

macrumors member
Original poster
Nov 28, 2020
34
2
Hey Guys, I hope I am writing in the right sub section, if not, please let me know. I would really appreciate any kind of response because I am loosing my mind over that s****. I have been trying to get everything running since tuesday... Like I already mentioned in the topic I already got Big Sur running on an SSD. I tried to install windows now with rufus but always get a bluescreen with the error key as follows: bcmwl63a.sys

Please give me a hint how I can get windows on my mac. This was the whole purpose of bying a 5,1. I want to play a few games but still enjoy macOS and did not want to have two machines.

Thank you all in advance and have a nice day!
 

startergo

macrumors 603
Sep 20, 2018
5,019
2,282
APPENDIX

Installing Windows 10

You will need:

Double-click the image file. The mounted volume will be referred to as CCCOMA_X64.​

Download the ZIP (click the code button View attachment 964680 and select download ZIP). The uncompressed folder will be referred to as OcBinaryData.​
Prepare two disks as follows:

Disk CUSB
Newly formatted exFat volume (GUID scheme)​
Newly formatted exFat volume (MBR scheme)​
This is where Windows will go​
This is where the installer will go​

Disk C should not be the same as Disk A. The volume of the USB disk will be referred to as USB.​

Add the exFat driver
The identifier should be something like diskAs1. Replace the actual identifier in the following step.​
  • Mount the EFI volume by entering: sudo diskutil mount /dev/diskAs1
You may need to authorize this. The volume should mount as /Volumes/EFI and appear as EFI in Finder.​
  • Copy OcBinaryData/Drivers/ExFatDxeLegacy.efi to EFI/OC/Drivers
Open the configuration file
Tell OpenCore about the driver
  • Find the Drivers key and add
XML:
<string>ExFatDxeLegacy.efi</string>
to the array​
Also, make sure that the VMM flag is off.​
Verify the configuration
  • Close config.plist
  • In Terminal, enter: plutil -convert xml1 config.plist && plutil config.plist
You should see config.plist: OK. If not, recheck all the steps.

Load the configuration
  • Copy config.plist back to /Volumes/EFI/EFI/OC
  • Reboot
Prepare the installer
Use the actual volumes names in the following step:​
  • Enter: rsync -r /Volumes/CCCOMA_X64/ /Volumes/USB
Let the task complete.​

Proceed with the installation
  • Reboot and select Windows (External) from the boot picker
The Windows installer should start.​
  • At the Windows Setup window, press Shift+F10 to open the Command Prompt
  • Start diskpart by entering: diskpart
Wait for the prompt.​
  • Identify your disks by entering: list volume
You should see something like​
Code:
Volume 1    C    Disk C    exFAT
Volume 2    D    USB       exFAT
Note the actual volume numbers and letters. Do not proceed if you are not sure! Replace the actual volume number of Disk C in the following step.​
  • Select Disk C by entering: select volume 1
Double check that you have the right volume number.​
  • Format the disk by entering: format quick fs=ntfs label=Windows
Wait for the task to complete.​
  • Enter: exit
Use the actual letter of the USB drive in the following step:​
  • Enter: D:
  • Backup the efi folder of the installer by entering: ren efi efi.bak
  • Enter: cd sources
  • Identify the version of Windows that you want to install by entering: dism /get-wiminfo /wimfile:install.wim
You should see something like​
Code:
Index : 1
Name : Windows 10 Home
Replace the actual index of the Windows version and the actual letter of Disk C in the following step:​
  • Apply the install image by entering: dism /apply-image /imagefile:install.wim /index:1 /applydir:C:\ /compact /EA
Wait for the task to complete.​
  • Create the boot files by entering:bcdboot C:\Windows /s D: /f uefi
Wait for the task to complete.​
  • Enter: exit
  • Close the Windows Setup window (click the X)
Click "yes" to restart your computer.​
  • Reboot into macOS
Copy the boot files
The identifier should be something like diskCs1. Replace the actual identifier in the following step.​
  • Mount the EFI volume by entering: sudo diskutil mount /dev/diskCs1
You may need to authorize this. The volume should mount as /Volumes/EFI and appear as EFI in Finder. This EFI volume should be empty.​
  • Copy /USB/EFI/Microsoft to /Volumes/EFI/EFI
  • Delete /USB/EFI and rename efi.bak to efi
  • Eject the USB
Finish the installation
  • Reboot and use the boot picker to select Windows
The configuration process should begin and eventually your computer will restart.​
  • Complete the configuration
 
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