![]() Once you've reset the NVRAM, power off and try the various Recovery Mode keyboard shortcuts again. Hold those keys down until your Mac reboots again and you hear the startup chime for the second time.You have to make sure you press these keys before the gray screen appears or it won’t work. Press the power button and then press the command option P R keys.Now open up DiskMaker X and choose Mavericks (10.9). Step 2: Run Through the Easy Instructions. Also, make sure you already have the Install OS X Mavericks file there, too, and a properly formatted USB drive before continuing. NOTE: Before following the steps below, ensure you have no external hardware connected and make sure you use the built-in keyboard. Just download DiskMaker X 3 and install it to your Applications folder. The easiest way to install the update is through the Mac Software Update mechanism, accessible from the Apple menu > App Store > Updates tab. Labeled as Security Update 2015-003 1.0, the update is available to all Macs running OS X Yosemite 10.10.2. To do this on your MacBook Air, follow the steps below. Apple has released an important security update for OS X Yosemite users. Since you're having problems with Recovery Mode I suggest you reset your Non-Volatile Random-Access Memory (NVRAM). Please note that if you haven't downloaded them directly from Apple then there is no way for anyone here to confirm the suitability/safety of what you've downloaded. IMPORTANT - Your question doesn't specify where you've downloaded the installers from. Hold down the shift option command R keys as soon as you power up to reinstall the macOS that came with your Mac, or the version closest to it that is still available 1ġ That third option is a new option only available since 27 March 2017 and requires macOS Sierra 10.12.4.įor more info refer to: About macOS Recovery.Hold down the option command R keys as soon as you power up to upgrade to the latest macOS that is compatible with your Mac. ![]() Hold down the command R keys as soon as you power up to reinstall the latest macOS that was installed on your Mac, without upgrading to a later version.You can boot into Recovery Mode and reinstall macOS from there. Regardless, your best option is usually to boot into Recovery Mode. My guess is that the copy of Yosemite you've downloaded is either 10.10.0, 10.10.1 or a build version of 10.10.2 earlier than 14C2043. To start with your MacBook Air will not run Mavericks, so you can put that one aside as incompatible.Īs for Yosemite, the earliest possible version that will run on your model MacBook Air is actually Mac OS X 10.10.2 (build 14C2043). ![]()
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