Help! How to clean up apparent partial Monterey install and revert to Big Sur? Bits of Monterey running?
I have had a ton of beachballing and really slow boots on my 2019 iMac. Hate to say I dont recall details cause it's going back months but It looks like I had started a Monterey update and backed out. Can anyone help suggest how to to clean up partial Monterey install and revert to my (perfectly fine) Big Sur? When I search the machine for "Monterey" I get these files: 12GB application "Install macOS Monterey", "install log", "InstallHistory.plist", "LPSpringboardValues.txt". I had begun to experiment with EtreCheck a bit and ran a scan, that scan says under "last-60-days installs" that I indeed installed Monterey 12.5, though all outward appearances show I am still runnning BigSur 11.6.4. Etre check also shows this:
2022-08-08 02:35:25 com.symantec.mes.systemextension - Crash (20 times)
Executable: /Library/SystemExtensions/*/com.symantec.mes.systemextension
Details:
dyld: launch, loading dependent libraries
Yikes. Any help massively appreciated!
iMac, macOS 10.13