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downgrade from Montery to Big Sur

Hi,


I've upgraded my mbp M1, 2020 to Montery a while ago. Since then my battery is much faster empty, I see the beachball to often and I have problems with connecting second displays. So I would like to downgrade to Big Sur. When I'm following one of the many how-to's on the net, they all at one point let me download Big Sur from the app-store. Trying to do so gives me the message that I can't update with a older version.


Does anyone knows this problem and have a solution for me?


Regards,


Erwin

MacBook Pro 13″, macOS 12.1

Posted on Feb 21, 2022 1:06 PM

Reply
Question marked as Best reply

Posted on Feb 26, 2022 4:13 AM

Run this Terminal command


softwareupdate --list-full-installers What is the output ?


It should list all available Full Installers this computer Qualifies to run.


Should it list Big Sur 11.6.4 good


Terminal command


softwareupdate --fetch-full-installer --full-installer-version 11.6.4



In theory it will download the Full Big Sur 11.6.4 and will not launch but will place in Applications Folder a new Application called " Install Big Sur "


Now make the  Bootable Installer for Big Sur



About Startup Security Utility on a Mac with the Apple T2 Security Chip Very Important to be able to Boot from External Drive on T2 computer


13 replies
Question marked as Best reply

Feb 26, 2022 4:13 AM in response to Erwin_M

Run this Terminal command


softwareupdate --list-full-installers What is the output ?


It should list all available Full Installers this computer Qualifies to run.


Should it list Big Sur 11.6.4 good


Terminal command


softwareupdate --fetch-full-installer --full-installer-version 11.6.4



In theory it will download the Full Big Sur 11.6.4 and will not launch but will place in Applications Folder a new Application called " Install Big Sur "


Now make the  Bootable Installer for Big Sur



About Startup Security Utility on a Mac with the Apple T2 Security Chip Very Important to be able to Boot from External Drive on T2 computer


Feb 21, 2022 2:15 PM in response to Erwin_M

Erwin_M Said:

"downgrade from Montery to Big Sur: Hi, I've upgraded my mbp M1, 2020 to Montery a while ago. Since then my battery is much faster empty[...]"

-------


Fro Reference:

Troubleshooting Mac Battery Draining:

Try a New Charger:

If it is charing from an external device, then use a new charger:


A Few Links to Refer to Power:





downgrade from Montery to Big Sur

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