My end goal is to install Windows 7 (required for my particular model / year) as required for my work. Turn your Mac, and hold down Option + Command + P + R key together right away. To restart your Mac in Recovery Mode, hold down the Command + R during startup until the Apple logo appears. If you know how to access superuser with a broken path I would love to hear it. Turn Wi-Fi off or unplug the Ethernet cord, depending on your configuration, to prevent your Mac from connecting to the Internet: Select Utilities>Terminal: Click the window that appears: and type date 0115124517 (this will reset the date to Jan 1st 12:45 2017). If you experience issues like Mac stuck on boot screen after update to latest macOS, resetting NVRAM/ PRAM may give you a hand. Go to Apples support website to access the Combo updater, find the update youre looking for and click Download. I have had trouble even finding it on the system or accessing it to no avail. You could say, you need to point directly to the commands because the PATH is broken, but certain keys like the : cannot be used, so it is a pain to fix this PATH. When I try to reformat my main drive, it says it “Couldn’t Unmount Disk.” I have tried going to the terminal and manually unmounting the disk, but the terminal is basically broken and does not recognize a lot of commands. Perhaps I should just update to a new SSD already? If you are wondering how to update your old MacBook Pro and are running into issues updating then you most likely need to update to 10.11 El Capitan first. I have an older MacBook Pro from mid 2009 that has worked fine, but I am currently unable to reinstall my macOS (there was El Capitan on it). I am stuck in a loop with Disk Utility and attempts at reinstalling a working macOS.

Mac el capitan update stuck at startup