Invoke Recovery mode while the Mac is starting up by pressing together the Command + R keys. Re-install OS X from OS X utilities and choose the OS X El Capitan Installer.once the process is complete, restart the Mac. Now that the macOS Sierra has been erased from your drive, you will need to re-install the OS X El Capitan. Type in Macintosh HD for the name as Mac OS Extended from the format list and then choose Erase. Select the indented volume name of your startup disk from the left side of the Disk Utility window, then click the Erase tab. Select Disk Utility from your OS X utilities. This launches your Mac into the recovery mode 
Hold Down Command +R keys together upon hearing the chime and hold the keys till you see the Apple logo appear on the screen. There you go, shame more than the normal machines are supported but if you got a good run out of a 6 year old machine that’s pretty good, you can always with with El Capitan or wait for the new MacBook Pro units sporting the Skylake processors. 
Or for you terminal freaks… system_profiler SPHardwareDataType > Apple Menu > About This Mac > More Info … > System Report … Model Identifier Which means most devices made prior to 2008 won’t be able to run it.
Mac Pro – all models from 2010, Mac Pro 5,1 – 6,1. Mac Mini – all models from 2010, Mac Mini 4,1 – 7,1. MacBookAir – all models from 2010, MacBook Air 3,1 – 7,2. MacBook Pro – all models from 2010, MacBook Pro 7,1 – 11,5. 
MacBook – all models from late 2009, MacBook 6,1 – 9,1. You’ll still require a 64bit Intel processor, 8GBs of free disk space – if upgrading, as appose to clean install min plus at least 2GB of RAM. And anything pre 2010 for MacBook Air, MacBook Pro, Mac Mini and Mac Pro. Apple has dropped support for any models pre late 2009 for MacBook and iMac. The name Sierra continues on with their California landmark theme, in this operating system the use of the term ‘OSX’ has now dropped the ‘X’ to ‘OS’.ĭisappointedly for some the new macOS will run on less machines than its predecessors including OSX 10.11 El Capitan. Apple have released a public beta of their new operating system named macOS Sierra.
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