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

Reply
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.



Similar questions

11 replies
Sort By: 
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.



Reply

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.

Reply

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

Lo_Ré wrote:

Yes. it had. I really can't explain.

FWIW, if one iMac had Big Sur installed and was upgraded to Monterey before you received it, then it should be possible to downgrade it. If the second iMac had Monterey originally installed, then as explained, it cannot be downgraded.

Reply

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

Not able to downgrade to previous macOS

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.