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I am ordering a bunch of new iMacs early next year and I assume they are going to have OS X Sierra and I have an image on an external disk for El Capitan and I am wondering if these new macs will allow me to deploy this image to them since they will come with the new OS X as default. <br />
<br />
In the past I have tried using an image with an older OS X on a new iMac and I just get this 'white do not enter' symbol and it seems like the hardware in the new macs prevent me from putting an older OS on it.<br />
<br />
Also if it is possible do you know whats the oldest OS X I am allowed to put on any new iMac? <br />
<br />
If you need more info let me know.<br />
Thanks
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I am ordering a bunch of new iMacs early next year and I assume they are going to have OS X Sierra and I have an image on an external disk for El Capitan and I am wondering if these new macs will allow me to deploy this image to them since they will come with the new OS X as default. 

In the past I have tried using an image with an older OS X on a new iMac and I just get this 'white do not enter' symbol and it seems like the hardware in the new macs prevent me from putting an older OS on it.

Also if it is possible do you know whats the oldest OS X I am allowed to put on any new iMac? 

If you need more info let me know.
Thanks

Can I roll-back a new iMac to an older OSX?

Mac OS X is the desktop operating system from Apple Inc., found on Macintosh computers. OS X consists of a Mach/BSD-based kernel, operating system interfaces primarily based on FreeBSD and additional frameworks (written in C, C++ and Objective-C providing user interface and application-level services.