Mac OS – How to create a USB installer and downgrade

Given the fact that there are applications that are yet to be updated to be compatible with MacOS Big Sur, quite a few people saw a need to downgrade back to their older MacOS versions.

I will discuss how to create an external USB bootable drive for multiple MacOS versions and how to use this drive including on systems which have a T2 chip on them.

The Apple support links are as follows:

https://support.apple.com/en-us/HT211683

https://support.apple.com/en-us/HT201372

The free archiver Keka can be found at:

https://www.keka.io/en

Let’s see how this works…

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