Tested on production 1.4GHz quad-core Intel Core i5-based 13-inch MacBook Pro systems with 8GB RAM, 256GB SSD and prerelease macOS Big Sur. Tested with prerelease Safari 14.0.1 and Chrome v85.0.4183.121. Performance will vary based on usage, system configuration, network connection and other factors. In September 2018, Apple released macOS Mojave, the current version of the Mac operating system. (In case you’re keeping track, it’s version 10.14.). MacBook Air (Mid 2012 or newer) MacBook. My Macbook Air is the old one bought in 2015, but I recently updated it to MacOS Catalina, so I followed the guide to reset it under your Catalina instructions. I managed to erase the Macintosh HD Data volume, but when I tried to erase Macintosh HD it said “Erase process has failed”.

• Macos Mojave Macbook Air 2017
• Macos Mojave Macbook Air 2015

Upgrade to macOS Big Sur

Before installing this upgrade, make sure that your Mac is ready.

Check compatibility

macOS Big Sur supports most Mac models introduced in 2013 and later.

Make a backup

Before you upgrade, make a complete backup with Time Machine, or store your files in iCloud.

Free up space

If the installer needs more storage space to upgrade, you can free up space using tools that come with your Mac.

Download macOS Big Sur

If you’re using macOS Mojave or later, choose Apple menu  > System Preferences, then click Software Update. If you’re using an earlier macOS, use the App Store instead.

Get to know macOS Big Sur

Learn about some of the new features of macOS Big Sur.

Control Center

Control Center brings favorite controls such as Bluetooth, Wi-Fi, Do Not Disturb, and Sound together in a single place—so you can easily adjust them at any time.

Notification Center

Notification Center puts notifications and>

Macos Mojave Macbook Air 2017

Safari

Customize your start page, navigate with ease using the new tab bar, and access a new privacy report to see just how Safari protects your privacy as you browse.

Maps

Discover great places around the world and navigate easier with guides, cycling directions, indoor maps, Look Around, electric vehicle routing, and more.

Messages

Send messages to friends and family using new tools that make it easier to keep track of group conversations and give you fun, engaging ways to express yourself.

Macos Mojave Macbook Air 2015

Photos

Use the expanded editing capabilities in Photos to easily make simple changes and more advanced adjustments to your photos.

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