Dec 02, 2020 How to Download macOS Big Sur on Unsupported Mac An EliteMacx86 Exclusive Guide - This guide covers downloading a copy of macOS Big Sur, unofficially. Overview Recently, Apple announced their new macOS lineup i.e macOS Big Sur 11.0 which is Apple's newest and most awaited OS. MacOS Big Sur on unsupported Mac I'm having an old MacBook Air 4.2, (mid 2011, SSD, 4 Gb memory), which have been running Catalina for quite some time despite that the max OS is High Sierra. I have been using the great work by dosedudes1 and his Catalina patcher.
Mac Os Big Sur Unsupported Mac Github
You start with creating a bootable USB with info from this post. Just pick Big Sur instead of the mentioned High Sierra.
Building/installing the patcher
After that follow these instructions,on how to install and use the OpenCore Legacy patcher.
Imac 2013 Big Sur
Remarks
- Erase/format the MAC HD/SSD before installation !! I really think that this does it more simple for the installer !!
- 'Mac OS Extended(journaled)' with an old non SSD HD
- With en SSD use 'APFS'
- The Mac rebooted several times during install.
- Don't remove the USB until at the very end.
- If you, like me, have a Mac which need the legacy video acceleration support please note that the Mac have a painfully slow display update before you have applied the 'Post-Install volume Patch'.
- Updating the Mac from Big Sur 11.4 to 11.5, made the messages.app stop working fixed in release 0.2.4
- Please note that 'Nightly Builds' are available but are for testing purposes only !!!