Apple might be late to the game, with Windows 10 bringing in Cortana in 2015, but Apple promises powerful Siri integration across the operating system. So, follow these steps to download and update macOS: Make sure you have a fast and stable WiFi connection. Mac OS Sierra brings with a couple of new features, the most important of them being Siri integration. For your installation to be successful, the network your Mac is connected to must use DHCP regardless of whether you have a Wi-Fi or Ethernet connection. To use iCloud, iTunes, and the Mac App Store, you will also need an Apple ID. Mac mini (Late 2009) Model Identifier: Macmini3,1 Part Numbers: MC238xx/A, MC239xx/A, MC408xx/A Newest compatible operating system: OS X El Capitan 10.11.6 Tech Specs: Mac mini (Late 2009) Mac mini (Early 2009) Model Identifier: Macmini3,1 Part Numbers: MB464xx/A, MB463xx/A Newest compatible operating system: OS X El Capitan 10.11. MacBook Air (11 and 13-inch from late 2010) MacBook (13-inch from mid-2010) MacBook Pro (13, 15 and 17-inch from mid-2010) Mac mini (From mid-2010) iMac (21.5 and 27-inch from mid-2010) Network. Your Mac must be running OS X 10.7.5 or later. Mac Pro (late 2012 or newer), iMac (late 2012 or newer), Mac mini (late 2012 or newer), MacBook Pro (mid-2012 or newer), MacBook (Early 2015 or newer), MacBook Air (mid 2012 or newer). To enjoy the full macOS Sierra experience, you need to be running these Mac's: However, not all of these devices will be able to take advantage of all the features of macOS Sierra partly due to their age and partuy due to planned obsolence. If you want the security benefits of full-disk encryption, you can reactivate FileVault after the update is complete. Mac Pro (Mid 2010) MacOS Sierra 10.12.MacBook (late 2009 and after), iMac (late 2009 and later), MacBook Air (2010 and later), MacBook Pro (2010 and later), Mac Mini (2010 and later), and Mac Pro (2010 and later). Now you should be able to update macOS without any issues. To fix the firmware issue, you need to install High Sierra or later macOS again on your hard drive and your data should be intact. I called and try apple support agent they try to do best but all solutions failed so you need to download Sierra from the App Store and upgrade as usual.
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