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Old 03-19-2020, 08:40 AM
jjsoundoc jjsoundoc is offline
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Default Rolling Back O.S.

My '09 Mac Pro needed to be replaced so I ordered a Mac Mini.
It was my understanding that Catalina could be rolled back to Mojave.
I sent the computer to OWC for a RAM upgrade and the O.S. rollback.
They called to say they couldn't roll it back.
Has anyone done this successfully, or sent it to someone else to do the work?
I did try to buy a mini with Mojave installed but couldn't find any.
I work in sound to pic so don't want to jump through the hoops that Catalina requires.
Thanks for any help,
JJ
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Old 03-19-2020, 08:57 AM
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JFreak JFreak is online now
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Default Re: Rolling Back O.S.

Which model exactly? Go to Apple menu, About This Mac, System Report and from there tell us the Model Identifier that you can see from Hardware Overview
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Old 03-19-2020, 08:59 AM
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Default Re: Rolling Back O.S.

As far as I know all Mac Minis should be able to run with Mojave so just download installer from App Store, create a bootable USB installer (google for instructions), then wipe the hard drive and install.
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Old 03-19-2020, 09:21 AM
jjsoundoc jjsoundoc is offline
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Default Re: Rolling Back O.S.

Janne,

The computer is being shipped back to me so can't access the model identifier.
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Old 03-19-2020, 09:23 AM
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Default Re: Rolling Back O.S.

Well once you have it back you can do it yourself. Just have 16GB or larger USB stick ready
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Old 03-19-2020, 09:28 AM
jjsoundoc jjsoundoc is offline
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Default Re: Rolling Back O.S.

I'll give it a try. Surprised that OWC couldn't do it..
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Old 04-03-2020, 03:13 AM
markanthonybr markanthonybr is offline
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Default Re: Rolling Back O.S.

I manage over 100 Macs for a University Music school here in London and just want to point out somethings from my latest experience:
1- the utilities security enable external boot only applied to Macs on sierra/ high sierra this wasn’t a necessary step with clean installs of Mojave it was an added security measure from apple in sierra/ high sierra.
2- If your mac is shipped with Catalina you wont be able to rollback to Mojave. This is based on my just having imaged 36 new mac minis in 2 of our mac labs.
3- target disk mode wont work using an original apple usbc cables only 3rd party cables still work. So carbon copy cloner running from an external drive worked fine for me.
4- Catalina will not make an older mac faster. Apples design model is to force you into buying new machines so I highly doubt the person who posted here that his iMac seemed faster because of the os update to Catalina is correct. He probably had improved performance from doing a clean install as wiping the disk and reinstalling will improve performance as bugs and permissions errors are put right or his mac was never configured properly. So I wouldn’t recommend that older mac users to rush into an OS upgrade based on that info.


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