Because storage is always encrypted on Mac systems with Apple silicon or the T2 chip, the system is instantly and securely "erased" by destroying the encryption keys. Since macOS Monterey, however, Apple has included a third option for newer Macs that offers a very simple and straightforward way to erase your Mac without needing to reinstall the operating system.įollowing in the footsteps of the iPhone and iPad, Apple silicon Macs and Intel Macs with a T2 security chip (2017-2020 models) now have an "Erase All Content and Settings" option available in macOS Monterey and Sonoma. However, even if neither of these issues have arisen for you, sometimes it's just nice to start afresh for that "brand new Mac" feeling and then migrate your apps, documents, and data, either manually, or by migrating from a Time Machine backup.Ĭlean installing previous versions of macOS usually involves creating a bootable copy of the macOS installer on a flash drive or USB stick and then reformatting your drive before installing the bootable copy on your Mac, or using macOS Recovery to reinstall the Mac operating system over an internet connection. This article explains how to perform what is effectively a clean install of Sonoma using a built-in option that's available on Apple silicon-powered Macs and Intel Macs with a T2 security chip.Ĭlean installing macOS is often done to remove annoying quirks and strange behaviors that a Mac may have inherited over time, and can also help to reclaim disk space caused by junk files left by third-party apps. If you'd like to learn how to make the best use of your iPhone, consider signing up for our free Tip of the Day.Apple is set to release macOS Sonoma on September 26, and whenever a new operating system is released for the Mac, some users prefer to perform a clean installation. If you feel that reverting to the previous iOS version is still the best option for you despite the setbacks mentioned above, follow the instructions below covering how to uninstall an iOS update. Note: All iOS 14 versions and iOS 15.0 and some iOS 16 versions have been unsigned by Apple, so you can no longer downgrade your iPhone software to these versions. To quickly check this, go to and select your device and desired software version to see if the iOS is still signed. If the software version is no longer signed, Apple has stopped supporting the iOS version and you cannot downgrade. Make sure the previous software version is still signed by Apple.This is because there is no way to downgrade your watchOS, and this may cause incompatibilities. Apple Watch users might lose some functionality. If you’ve already installed the latest watchOS on an Apple Watch, you may not be able to fully use your wearable after downgrading your iPhone software. ![]() ![]() While you can still use an earlier backup, you will still be losing some data. This is because a later version backup cannot be used after you downgrade to an earlier software version. You will lose any data from after your latest iOS update. ![]() Because of this process, there are a few important points you need to consider before making the decision to uninstall the latest iOS: To reinstall an iOS update, you'll need to download the previous software version on your computer, restore your iPhone to factory settings, load the downloaded software on your iPhone, then restore your data from a previous backup.
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