MacOS Big Sur successfully installed and running triple boot on single hard internal SSD with rEFInd on Microsoft Surface Pro 4. (MacOS Big Sur 11.2, Ubuntu 20.04 and Windows 10)

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MacOS Big Sur 11.2

Good afternoon, everyone.

So this is my very first post.I would just like to say thank you to all the people that posted even the tiniest bit of information that ultimately led to this result.

I currently now have a triple boot system that is seemless in terms of transition due to rEFInd handling it beautifully after some tweaks.

So my build is as follows:

CPU: i5-6300U @ 2.40GHzGPU: Intel HD Graphics 520RAM: 8GbMake / Model: Microsoft Surface Pro 4Wifi/BT Card: Marvell AVASTAR Wireless-AC (integrated)Touchpad / Keyboard: Surface Type CoverTouch display: WACOM (integrated)Firmware revision: Latest provided by Microsoft as of April 24th, 2021

What's working:

On Windows 10: Everything.

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On Ubuntu 20.04: Everything, apart from both cameras (using 4.19 LTS Surface kernel).

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On MacOS Big Sur 11.2:

1 - CPU

2 - GPU

3 - Surface Type Cover

4 - USB 3.0

5 - NVMe SSD

6 - Audio (including 3.5mm headphone jack)

7 - Sleep / Wake

8 - Mini Display Port output

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What's not working:

On Windows 10: Nothing, everything is operational.

On Ubuntu 20.04:

1 - Cameras

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On MacOS Big Sur 11.2:

1 - Wifi (built-in) - I bought a USB dongle to fix this (COMFAST CF-811AC) and will be using chris1111's drivers to get it up and running.

2 - Cameras

3 - Touchscreen

4 - Volume buttons

5 - Power button (sometimes it does, sometimes it doesn't)

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I spent most of my free time over the course of two weekends trying to get to this very exact result. I should point out that I also have a version of GRUB working, should rEFInd ever go berserk. I also themed that as much as I could, as to have the most pleasant viewing experience (for me, at least). Bear in mind that OpenCore does some ACPI modifications and that is why I am not using it as a bootloader, as trying to boot Windows consistently failed. So I gave up on that eventually and just made it so the default OpenCore boot system was MacOS, not even showing the GUI picker, which makes it seemless.

But by default, reFInd boots to Windows (because I want it too).

I struggled a lot to get this working the way it is now. A lot of trial and error and reformatting to getting things just right.

Hopefully you guys enjoy this.Feel free to hit me up should you have any questions, I would be more than happy to help, if I can.