How to install Big Sur to Mac Mini Late 2012 and other Catalina-capable machines
Update from Nov 22 2020: I updated the guide for a release version of a Big Sur! Now it uses some new tools made by community, that makes process a lot easier in many ways. The information provided below was confirmed to be valid on a 11.0.1.
Update from Feb 28 2021: I’ve successfully updated my 11.0.1 installation to 11.2.1 and added information about updates.
With the new release of Big Sur, apple have dropped my “brand new” Mac Mini Late 2012, so that’s how I made it work with the help of MacRumors community.
Grab a 16GB USB drive
To install Big Sur, you’ll need an USB drive of at least 16GB in capacity.
Make a Time Machine backup
As always, before installing a new major release of any macOS, you should do a TM backup, especially before installing a Big Sur, which changes TM backups in some ways.
Create separate volume
Please, don’t install it as a single OS. If you have a working OS on your machine, please KEEP IT. Run Disk Utility and create new partition, at least 60 GB in size.
Important: it must be not in the same container as your current mac installation. Installing Big Sur in the same APFS container as your current macOS installation will cause issues. Create separate Partition, not just Volume.
Create installation USB
- Open Disk Utility
- Format your drive with “Mac OS Extended (Journaled)” and “GUID Partition Map”. That “GUID” part IS IMPORTANT! Micropatcher cannot be applied to a MBR partitioned drive!
All data on the USB drive will be destroyed in this process!
Versions that proven to be working for me:
- 11.0.1 (initial install)
- 11.2.1 (update via full installer and running patcher again)
Warning! Before trying to install anything newer than 11.2.1, please make sure that it’s still supported by micropatcher! There are some troubles in installing 11.3 Beta 2, which was not resolved at the time of writing this guide. 11.2.1 is your best bet for now (as of Feb 28 2021).
If you have supported mac around, you can just download Big Sur installer from the MAS.
Otherwise, follow this guide:
For downloading Big Sur installer, we will use a tool called gibMacOS
- Open this link, and press green “Code” button, and download as zip
- Unzip it, and run gibMacOS.command in the folder
- Wait unil “Available Products” screen, enter number of the Big Sur option and press Enter. Also, you can choose specific version, look at the terminal screen for the info about it
- Wait until it finishes
- After that, open “macOS Downloads” folder in the gibMacOS folder, and run InstallAssistant.pkg
- Select your current OS drive, and wait until it finishes
- Installer will be in Applications
Source: https://dortania.github.io/OpenCore-Install-Guide/extras/big-sur/#grabbing-the-installer, macrumors forum
Creating Installer USB
Open terminal and do this:
sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/Your\ Usb\ Volume\ Name
Patching installer and installation
For further steps, look at the big-sur-micropatcher’s README:
There is seemingly a lot of steps, but you can start right from the step 6, and ignore steps 12, 16, 18 and 19 if installing on the Mac Mini 2012.
A primitive USB patcher for installing macOS Big Sur on unsupported Macs By the way, if you have a Mac Pro, Big Mac by…
It’s already very detailed and there is no need to copy-paste it here :)
After all these steps, you should have perfectly working Big Sur installation with WIFI and etc.
For now, OTA updates are not supported for this installations. However, there is a way of updating Big Sur installations using full installer.
The steps are:
- Make sure that desired version is still supported by micropatcher
- Create an usb drive
- Apply micropatcher just as you did when installed originally
- Install with updating your current installation
- Run patch-kexts from recovery
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