El Capitan on 2017 iMac?

oYx

macrumors regular
Original poster
Sep 2, 2007
191
3
London
Did any try installing El Capitan on their 2017 iMac? Or even Yosemite? Is it possible?
 

old-wiz

macrumors G3
Mar 26, 2008
8,315
225
West Suburban Boston Ma
Generally you cannot install an OS older than the one that shipped with your Mac. If your system shipped with Sierra, then you cannot install anything pre-Sierra due to not having the right drivers for the new hardware.
 

MacsRgr8

macrumors 604
Sep 8, 2002
7,855
1,175
The Netherlands
Even if you would restore a working OS < pre-installed OS (= macOS 10.12.5 "special build') it will not start up.
All necessary drivers simply exist only on the pre-installed OS and upwards.

Has been like this on Macs since.... ever..?
 

CaffeinePizza

macrumors newbie
Jun 23, 2017
8
0
Even if you would restore a working OS < pre-installed OS (= macOS 10.12.5 "special build') it will not start up.
All necessary drivers simply exist only on the pre-installed OS and upwards.

Has been like this on Macs since.... ever..?
You can run Snow Leopard on a Late 2011 Macbook Pro which shipped with Lion. However, you must run at least 10.6.7 I believe. I've done it out of curiosity.
 

cynics

macrumors G4
Jan 8, 2012
11,554
1,873
On an iMac it will be tough due to GPU driver support. Not saying its impossible, but it is impractical. And if its not a "fun project" will likely end up being a "total nightmare".

I'm assuming you have some software that doesn't have Sierra support?
 

EugW

macrumors G3
Jun 18, 2017
8,262
5,636
I couldn't even run the usual release version of 10.12.5 on the 2017 iMac... and the 2017 iMac ships with 10.12.5. The Mac refused to boot.

10.12.5 on a 2017 iMac is a later build than the release version of 10.12.5 that all the other non-2017 Macs have. Thus, I could not do a direct clone from an older iMac with 10.12.5 to the 2017 iMac.

This problem is solved now though, since 10.12.6 is out, and it should be the same build for everyone.
 

oYx

macrumors regular
Original poster
Sep 2, 2007
191
3
London
On an iMac it will be tough due to GPU driver support. Not saying its impossible, but it is impractical. And if its not a "fun project" will likely end up being a "total nightmare".

I'm assuming you have some software that doesn't have Sierra support?
Yes, that's the reason.
[doublepost=1501294916][/doublepost]
I couldn't even run the usual release version of 10.12.5 on the 2017 iMac... and the 2017 iMac ships with 10.12.5. The Mac refused to boot.

10.12.5 on a 2017 iMac is a later build than the release version of 10.12.5 that all the other non-2017 Macs have. Thus, I could not do a direct clone from an older iMac with 10.12.5 to the 2017 iMac.

This problem is solved now though, since 10.12.6 is out, and it should be the same build for everyone.
Looks like I shouldn't even try it then.

I didn't meet that problem, as I decided to start fresh by manually copying my data over from a hard disk backup. My previous iMac was already gone when the 2017 one arrived.
 

Fishrrman

macrumors Core
Feb 20, 2009
19,444
6,741
"Did any try installing El Capitan on their 2017 iMac? Or even Yosemite? Is it possible?"

Impossible.
Can't be done (at least as the "boot OS").

An alternative method might be to install a virtual machine, and then run an older OS that way...
 
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