If anything else I will be calling them again asking for an appointment. I’ll just repeat it and see what happens. Mine just barely ran into an error at the very end of the install… Once you are at the login screen at the top left select Erase Mac I believe is the name of the selection you should select.įollow the prompts to erase and reinstall the selected macOS on the Macintosh HD. Once it has completely powered off wait a few seconds then push the power button to turn your MacBook on and quickly press and hold the Command-R keys until either a loading screen or utility screen appears. Select your network enter your network pw.Īfter completing this press and hold down your power button to shut the MacBook off. Push your power button to turn your MacBook on and quickly simultaneously push and hold the Command-Option-R keys for approximately “7” seconds and release when the screen prompts you to select a network. Hold down the power button until your MacBook shuts down. (My daughter had my MacBook for over a year for school). Or reinstall MacOS like I did, only because I don’t recall when I last did time machine. You will either need to try to reinstall from your time machine if you backed up to there. Had to wait for the holidays just to get this done and over with! Hope you find this helpful! When your Mac is already open, find Migration Assistant and access the your last backup in your external drive. It’ll restart after the upgrade is done.ġ1. The upgrade should go smoothly as you have previously emptied the drive. Download macOS Big Sur through the AppStore. When the Mac is already open using the older version of MacOS, open the AppStore and find macOS Big Sur.ġ0. When it’s over, it’ll restart your device.ĩ. Select reinstall the original MacOS version (e.g. It’ll take a few minutes before the internet recovery interface opens.Ĩ. Before it turns on, press and hold Option-Command-R until the globe icon appears. Use first aid on MacOS to make sure there are no errors.ħ. Open disk utility and erase MacOS Data-HD and select the extended version. This should put your Mac on recovery mode (For more information on recovery mode, please check: ).Ĥ. While it’s off, press and hold Command-R until the Apple logo appears. BACKUP YOUR DEVICE using a external hard drive.ģ. But be sure to backup your device before you do this and check if it’s compatible with the latest OS (check here: )ġ. UPDATE: I’ve already installed macOS Big Sur by clean installing, downgrading then upgrading. If you were able to download the full Big Sur installer before this issue happened, then you are one of the only people with a full installer right now! Maybe you can burn it to a Dual Layer DVD and sell it on ebay haha! (will have to be a blu-ray disc as a DL dvd is only 8.5GB and the Big Sur Installer is 12.2GB LOL) installinstallmacos.py is working for me but I’m still getting the error in the Software Update pane. UPDATE 11/12 7:00PM CST – Some users are reporting that the download is starting to work. UPDATE 11/12 7:30PM CST – The download is working in the Software Update pane now. Install this package and it will put macOS Big Sur into your /Applications folder! What this will do is download the entire InstallAssistant.pkg file. UPDATE 02/20/21 – I’m still getting a bunch of people reaching out saying that they are still getting the error even after Apple fixed the issue! You can download the full macOS Big Sur installer directly from Apple’s servers via Safari. A few hours later, users started to report download problems. macOS Big Sur was launched at 12:00PM CST. MacOS Big Sur 11.0.1 – Installation failed An error occurred while installing the selected updates.
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