Apple has made it so that your machine will not upgraded by removing support for it.
Disappointedly for some the new macOS will run on less machines than its predecessors including OSX 10.11 El Capitan. Apple has dropped support for any models pre late 2009 for MacBook and iMac. And anything pre 2010 for MacBook Air, MacBook Pro, Mac Mini and Mac Pro.
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.
The Macs that will run macOS Sierra
iMac – all models from late 2009, iMac 10,1 – 17,1
MacBook – all models from late 2009, MacBook 6,1 – 9,1
MacBook Pro – all models from 2010, MacBook Pro 7,1 – 11,5
MacBookAir – all models from 2010, MacBook Air 3,1 – 7,2
Mac Mini – all models from 2010, Mac Mini 4,1 – 7,1
Mac Pro – all models from 2010, Mac Pro 5,1 – 6,1
Which means most devices made prior to 2008 won’t be able to run it.
The ones that fall short…
– macOS Sierra won’t run on –
iMac 4,1 – 9,1
MacBook 1,1 – 5,1
MacBook Pro 1,1 – 5,2
MacBookAir 1,1 – 2,1
Mac Mini 1,1 – 3,1
Mac Pro 1,1 – 4,1
Xserve 1,1 – 3,1
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'''UPDATE'''
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Here's how I did it on a 2009 MacPro : https://www.ifixit.com/Answers/View/337306/EFI+and+Firmware+update+from+4%2C1+to+5%2C1+for+Sierra+Upgrade+Solved
Apple has made it so that your machine will not upgrade by removing support for it.
+
Apple has made it so that your machine will not upgraded by removing support for it.
+
Disappointedly for some the new macOS will run on less machines than its predecessors including OSX 10.11 El Capitan. Apple has dropped support for any models pre late 2009 for MacBook and iMac. And anything pre 2010 for MacBook Air, MacBook Pro, Mac Mini and Mac Pro.
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.
The Macs that will run macOS Sierra
iMac – all models from late 2009, iMac 10,1 – 17,1
MacBook – all models from late 2009, MacBook 6,1 – 9,1
MacBook Pro – all models from 2010, MacBook Pro 7,1 – 11,5
MacBookAir – all models from 2010, MacBook Air 3,1 – 7,2
Mac Mini – all models from 2010, Mac Mini 4,1 – 7,1
Mac Pro – all models from 2010, Mac Pro 5,1 – 6,1
Which means most devices made prior to 2008 won’t be able to run it.
Apple has made it so that your machine will not upgrade by removing support for it.
+
Disappointedly for some the new macOS will run on less machines than its predecessors including OSX 10.11 El Capitan. Apple has dropped support for any models pre late 2009 for MacBook and iMac. And anything pre 2010 for MacBook Air, MacBook Pro, Mac Mini and Mac Pro.
+
+
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.
The Macs that will run macOS Sierra
iMac – all models from late 2009, iMac 10,1 – 17,1
MacBook – all models from late 2009, MacBook 6,1 – 9,1
MacBook Pro – all models from 2010, MacBook Pro 7,1 – 11,5
MacBookAir – all models from 2010, MacBook Air 3,1 – 7,2
Mac Mini – all models from 2010, Mac Mini 4,1 – 7,1
Mac Pro – all models from 2010, Mac Pro 5,1 – 6,1
Which means most devices made prior to 2008 won’t be able to run it.
Apple has made it so that your machine will not upgrade by removing support for it.
The Macs that will run macOS Sierra
iMac – all models from late 2009, iMac 10,1 – 17,1
MacBook – all models from late 2009, MacBook 6,1 – 9,1
MacBook Pro – all models from 2010, MacBook Pro 7,1 – 11,5
MacBookAir – all models from 2010, MacBook Air 3,1 – 7,2
Mac Mini – all models from 2010, Mac Mini 4,1 – 7,1
Mac Pro – all models from 2010, Mac Pro 5,1 – 6,1
Which means most devices made prior to 2008 won’t be able to run it.
The ones that fall short…
– macOS Sierra won’t run on –
iMac 4,1 – 9,1
MacBook 1,1 – 5,1
MacBook Pro 1,1 – 5,2
MacBookAir 1,1 – 2,1
Mac Mini 1,1 – 3,1
Mac Pro 1,1 – 4,1
Xserve 1,1 – 3,1