It may happen that your MacBook’s performance slows down, or you simply need a clean system. In such cases, reinstalling your device is one of the best solutions. With the steps below, you can complete the process quickly and without issues.
However, it’s important to note that a macOS update and a full MacBook reinstall serve different purposes. An update upgrades your operating system to a newer version while keeping your data, apps, and settings intact.
You can read more about this in our previous article.
In contrast, reinstalling your MacBook results in a completely clean system, where all previous data and settings are erased. That’s what this guide is about!
Before starting the installation on a clean system, it’s important to back up your data. If your Mac is still working, you can easily do this using Time Machine to an external drive or a NAS. If your Mac no longer starts properly, it’s worth logging into iCloud from another Apple device to check whether your important files are available.
You’ll need an internet connection to reinstall your laptop, as the latest version of macOS will be downloaded from Apple’s servers. Follow these steps:
Turn off your MacBook
Start recovery mode:
3. From the macOS Utilities menu, select Reinstall macOS
4. Follow the on-screen instructions, choose the appropriate drive, and start the installation
Installing the operating system on a clean Mac usually takes 30–60 minutes, depending on your internet speed and MacBook model. Make sure your laptop is connected to a power source and do not interrupt the process.
If you want a completely clean system, it’s recommended to erase the SSD beforehand using Disk Utility.
Select the internal drive, then click “Erase” and set the format to APFS or Mac OS Extended (Journaled)
When reinstalling different macOS versions, compatibility should also be considered.
If you’re using an older MacBook (for example, one running macOS Sierra), the latest version like Sonoma may not be supported. In this case, choose a compatible version.
Once the new system is installed, you’ll need to complete the following setup steps:
Connect to Wi-Fi
Sign in with your Apple ID
Restore your Time Machine backup (if you created one earlier)
Configure basic system settings
TIP: If you encounter any issues during the process (for example, if the installation doesn’t start or you receive an error message), it’s worth downloading the macOS installer from another Mac and performing the installation via a USB drive.
In similar situations—or if you’d rather not deal with the reinstallation yourself—contact our MacBook service, where our experts are ready to help.
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