iMac fan runs constantly; how to downgrade macOS?
how to downgrade from os Tahoe 26? iMac fan running all the time now! thanks
iMac (2017 – 2020)
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You would need to erase the hard drive and install another version from scratch using a bootable USB drive or macOS Recovery.
Make sure you backup any files and data you want to preserve as returning to a previous macOS version is a fully destructive process and will erase everything.
click here ➜ Use macOS Recovery on an Intel-based Mac - Apple Support
or here ➜ Create a bootable installer for macOS - Apple Support
With that said, fans running means the CPU and other components need to be cooled down. Having the fans run means the components won't overheat. After an update it's normal for the CPU to work harder than normal to finish up background tasks. It should after a few days return to normal though.
41 replies
Jim, thank you, I will not be doing that.
ok, thanks I will leave the report with the post.
Owl-53 thanks so much for the info.
Quick question cause this is way over my head!,
I'm going to type this exactly as you have it typed out, spaces and no spaces where you have them correct?
Owl-53, thank you so much! Please bear with me, All this is way over my head! ;)
do I copy it with Command 1, command 2 and 3 or just what is after each command?
Thanks, Becky
kmutil
Short for Kernel Management Utility.
Tells kmutil to build and install kernel collections used at boot time.
--update-all
Rebuild all relevant kernel collections, not just one
Owl-53 thank you so much! for all your help and answering all my questions!
You are welcome
🦉-53
Owl-53 well I'm back with another question! Sorry!
after I put in the first command and hit return it said PASSWORD I tried the password to start my Mac but could not type anything!? any thoughts?
Thanks Jim, when finished I got line after line of errors and warnings, so not sure what happened, I copy and pasted as stated.
It should have worked
Did the commands Remove the Soundflower.kext ?
iMac fan runs constantly; how to downgrade macOS?