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Post originale di: mayer ,

Testo:

Owen, first find out what year your machine is.  The reason is the The 2009 model will not upgrade to High Sierra without an EFI flash.  Also the 2006-2008 model look very similar to the later machines but will only take up to a maximum of El Capitan.

Go here and input your serial number then let us know what you have.  https://everymac.com/ultimate-mac-lookup/

Stato:

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