![]() Wait for the macOS Utilities screen to appear, then click Disk Utility. ![]() Is it safe for me to reformat it or will I need some kind of owner verification from him? If you want to erase your startup disk: Start up your computer in macOS Recovery, then choose Disk Utility in the Recovery app. MacBook Pro 15" Unibody Late 2011 Choose your Mac's. Apple doesn't make intervening installers available when it recognises that the machine should run Sierra. In the video posted below, we're using a mid-2015 MacBook. Click the gear icon labeled Options, then click Continue. My end of 2011 macbook pro is supposed to accept Sierra but freezes when I tried installing it. Select the disk from the menu, select your language, then choose Disk Utility from the Utility drop-down menu and proceed to reformat it to the right settings.
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