how to downgrade OS
hi, i use mac os big surr right now, and i think i don't like (i'm sorry about that), i wanna use mac os high sierra again, can you help me.?
thanks
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First of all make a full back up of your mac.
Next download the full High Sierra installer app,
open your Safari browser and click on this link,
How to get old versions of macOS – Apple Support
Go to Download OS and click on macOS High Sierra,
this will redirect you to the App Store High Sierra download page.
It should say Get or Download, you may have to Control-click on the button.
This will download Install macOS High Sierra.app to your Applications
folder it should be 5.24GBs in size.
When it has downloaded you need to make a bootable USB stick installer,
read these instructions.
How to create a bootable installer for macOS – Apple Support
Having done that boot to the USB installer see instructions in
article above.
Open Disk Utility press Continue, click on View in the menubar
and select Show All Devices.
Highlight the Disk not any indented Volumes and click on Erase.
Give the Disk a name
Format: APFS
Scheme: GUID Partition Map
Click Erase.
When done quit Disk Utility.
Click on Install OS the installation procedure should start follow the prompts.
When the installation has finished you can then restore your personal data
back to the mac. Only restore your personal data not any System or Library folders
as this will put Big Sur back on your mac. Do not restore any apps as they will be
Big Sur versions and not work in High Sierra.
Only your personal data.
Do you use Photos in Big Sur the photos library is not backwards compatible with
earlier OS's so you will need to export your images from the photos library before
you downgrade.
Any documents etc you created or edited in Big Sur may not be backwards compatible
with the High Sierra versions of the apps that created/ edited them.