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Not able to downgrade to previous macOS

I'm trying to downgrade from Monterey to BigSur on an iMac with T2.

I've already enabled in security boot from external devices.

I've created a working bootable usb with BigSur, but,

when I try to boot from option it sees the usb disk with big sur, and let me choose it, but comes back to internet recovery in monterey.

Guess what I've missed..


Posted on Apr 22, 2022 5:11 AM

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Question marked as Top-ranking reply

Posted on Apr 22, 2022 8:08 AM

There is the answer - Monterey installed as a New Computer can not be downgraded/


Even if using a Bootable Installer of Big Sur or another means period.


The Apple " Licence of Use" prohibits installing an Older Version of macOS than the one it came with pre-installed.



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11 replies
Question marked as Top-ranking reply

Apr 22, 2022 8:08 AM in response to Lo_Ré

There is the answer - Monterey installed as a New Computer can not be downgraded/


Even if using a Bootable Installer of Big Sur or another means period.


The Apple " Licence of Use" prohibits installing an Older Version of macOS than the one it came with pre-installed.



Apr 22, 2022 6:26 AM in response to Lo_Ré

Q - " I'm trying to downgrade from Monterey to BigSur on an iMac with T2."


A - If this computer can New and Installed with Monterey macOS 12 - this downgrade can not be done - period.


The Apple " Licence of Use" prohibits installing an Older Version of macOS than the one it came. with pre-installed.

Not able to downgrade to previous macOS

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