- Joined
- Feb 18, 2013
- Messages
- 109
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- 18
- Location
- Kent.UK.
- Your Mac's Specs
- Mid 2012 MBP i7 2.6 GHz 16GB Ram Catalina. iPad Air 2, iPhone 12
When you did the clean install did you repartition and reformat the drive? Big Sur makes some changes to the drive structure that are NOT compatible with older versions of the OS. To get around the problem, you must repartition and reformat to end up with a totally empty drive to install Mojave successfully. It could be that although your install seems ok, and you can boot, that the rest of the drive that Big Sur used is not available to you unless you do the repartition/reformat/reinstall.
Yes. That is what I was saying you had to do to get it right.
Yes. That is what I was saying you had to do to get it right.
You can probably migrate from a TM backup after you the the OS install properly. When it first boots it will offer to migrate data before you get a chance to create an account. Take that offer and point to the TM drive and select what you want restored. Let it do its thing and eventually it will let you log into your account with the name username and password as before. The one thing that might make it a bit dodgy is that the backup was made with Big Sur and you are going backwards, so the migration might not work. But. it's worth a try to avoid having to reinstall everything
Assuming you are going to use Disk Utility to erase your drive you must erase the drive media itself. The item at the top of the list and you must ensure you unmount Macintosh HD and Macintosh HD_Data first.
I'm sure you'll get it this time, you obviously got the rest of the process nailed, When formatting the drive media you have to choose the additional Partition Mapping option, choose GUID. You can name it anything but to avoid confusion down the line I'd stick to Macintosh HD and format as APFS.
Just out of curiosity why are going back from Big Sur to Mojave?
I'm sure you'll get it this time, you obviously got the rest of the process nailed, When formatting the drive media you have to choose the additional Partition Mapping option, choose GUID. You can name it anything but to avoid confusion down the line I'd stick to Macintosh HD and format as APFS.
Just out of curiosity why are going back from Big Sur to Mojave?
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Truth is Rod I have a couple of 32bit apps that I still want to use and I just get the feeling that with Big Sur I am no longer in control. Apple wants to poke its nose in at every opportunity (even more than usual lol) I never really got on with Catalina and I just feel comfortable with Mojave and it seems to run better on my iMac.
I now have everything reinstalled and all seems to be running fine.