How to Downgrade from macOS Sierra to OS X El Capitan

Richard Bennett

Sep 29, 2026• Proven solutions

TL;DR:

Downgrading from macOS Sierra to OS X El Capitan requires completely erasing your current startup disk in OS X Utilities before reinstalling the older operating system and recovering your personal files.
    ● Hold Command+R immediately after the startup chime to open OS X Utilities, select Disk Utility, and completely erase the macOS Sierra drive using the Mac OS Extended format.
    ● Depending on the Mac's purchase date, Internet Recovery Mode may initially install an older factory-shipped OS like Mavericks or Yosemite, meaning you must subsequently download OS X El Capitan from the Mac App Store purchased list.
    ● The entire procedure requires a stable Wi-Fi or Ethernet connection and relies on having a pre-existing Time Machine backup containing your OS X El Capitan data for the final restoration step.

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Quick answer: To downgrade from macOS Sierra to OS X El Capitan, back up your Mac first, start macOS Recovery, erase the startup disk, reinstall a compatible version of OS X, and restore your files from Time Machine. Erasing the startup disk removes the current system and personal data, so do not begin until you have a verified backup and the correct installer or recovery option.

Important compatibility note: macOS Sierra and OS X El Capitan are legacy operating systems. The exact recovery result depends on your Mac model, firmware, purchase history, Apple ID, and the installers available to you. On some Macs, Command-R may reinstall the currently installed version or the latest compatible version instead of El Capitan. Check your Mac model and confirm that the older system supports it before erasing the disk.

Computer technology has gone through constant change over the last decade. Apple has released many macOS versions, and each release introduces new features, compatibility requirements, and system behavior. If macOS Sierra is not a good fit for your workflow, you may consider returning to OS X El Capitan, provided that your Mac supports the older operating system and you have a safe recovery plan.

Before You Downgrade: Safety Checklist
Erase macOS Sierra from the startup disk
Reinstall OS X El Capitan or another compatible version
Restore your files with Time Machine
Downgrade FAQ and safety checks

Keep this guide open on another device or print it before restarting the Mac you plan to downgrade. You will also need a stable internet connection. If the Mac contains important work, confirm that the backup can be opened or restored before proceeding.

Before You Downgrade: Safety Checklist

Back up documents, photos, application data, browser data, and other files that you cannot replace.
Verify that the Time Machine backup is recent and belongs to the Mac you are downgrading.
Confirm that OS X El Capitan is compatible with your exact Mac model.
Prepare the Apple ID, recovery credentials, and installer source that may be required.
Connect the Mac to power and use a stable Wi-Fi or Ethernet connection.
Understand that erasing the startup disk permanently removes the data stored on that disk.

If you cannot verify a backup or installer, stop before the erase step. A downgrade is a system migration, not a routine software update.

Step 1: Erase macOS Sierra

The first stage removes the current system from the startup disk. The erase action is destructive, so read the disk name and format carefully before confirming it.

Connect the Mac to a stable internet connection through Wi-Fi or Ethernet, and connect it to power.
Open the Apple menu and select Restart.
As soon as the Mac begins to restart, hold Command-R until the macOS Recovery or OS X Utilities screen appears.
Select Disk Utility, then select Continue.
Select the startup disk in the sidebar. On older systems, this may be named Macintosh HD or another custom name.
Select Erase. Enter the disk name you want to use, such as Macintosh HD.
Choose the file system requested by the compatible installer. Older OS X workflows commonly use Mac OS Extended (Journaled), but the correct choice depends on the Mac and installer.
Confirm the erase operation and wait for Disk Utility to finish.

When the erase is complete, quit Disk Utility to return to the OS X Utilities or macOS Recovery screen. Do not continue if the wrong disk was selected or if the erase process reports an error.

Step 2: Reinstall OS X El Capitan

After the startup disk has been erased, you need an installer that the Mac can use. In Recovery, select Reinstall OS X or the equivalent reinstall option, then follow the on-screen instructions.

From the OS X Utilities or macOS Recovery screen, select Reinstall OS X, then select Continue.
Read the software license information and accept the terms when prompted.
Select the erased startup disk as the installation destination.
Allow the installation to complete without closing the lid, disconnecting power, or interrupting the network connection.

The version offered by Recovery can vary. Depending on the Mac model and its purchase history, Internet Recovery may reinstall the system that originally shipped with the Mac, the latest compatible system, or another version supported by Apple's recovery service. If Recovery does not offer El Capitan, you may need a valid El Capitan installer or a bootable installer created on another compatible Mac. Confirm the installer source through Apple's current support documentation before using it.

When the installation finishes, complete the initial setup. If the Mac first installs an older compatible version, you may be able to download OS X El Capitan from the Mac App Store's purchased history when it is associated with your Apple ID and compatible with the Mac. Availability can change, so do not erase the disk until you know which installation path you will use.

Step 3: Restore Your Data from Time Machine

Once OS X El Capitan or another compatible system is running, use Migration Assistant or the Time Machine restore option to bring back your documents and settings. The original recovery-based process is outlined below.

Connect the Mac to the internet and connect the Time Machine backup drive if it is not already available over the network.
Open the Apple menu and select Restart.
Hold Command-R during startup if you need to open Recovery.
Select Restore from Time Machine Backup in the OS X Utilities screen, or open Migration Assistant after setup.
Select Continue and read the information about restoring a backup.
Select the source that contains the Time Machine backup.
Choose the most recent backup that contains the files and system state you want to restore, then continue.

The restore may take a while depending on the backup size, connection speed, and Mac hardware. Keep the Mac connected to power and do not disconnect the backup source during the process. After the restore, check your documents, applications, user account, and available storage.

Result: Your Mac should now be running the installed compatible version, with personal data restored from Time Machine. If an application or driver does not work after the downgrade, check whether it supports OS X El Capitan and reinstall a compatible version.

Downgrade FAQ and Safety Checks

Will erasing the startup disk delete my files?

Yes. Erasing the startup disk removes the operating system and data stored on that disk. Keep a verified Time Machine backup or another complete copy before you erase anything.

Does Command-R always reinstall OS X El Capitan?

No. Recovery can offer a version determined by the Mac model, firmware, purchase history, and Apple's recovery service. Command-R alone does not guarantee that El Capitan will be installed.

Can every Mac that runs macOS Sierra run OS X El Capitan?

No. Compatibility is model-specific. Check the supported Mac models for OS X El Capitan before starting, and remember that newer hardware may require a later system.

What should I do if I do not have a Time Machine backup?

Do not erase the Mac yet. Copy important files to an external drive or another safe location and confirm that the copies open correctly. Without a backup, a failed downgrade can result in permanent data loss.

Why can an application stop working after the downgrade?

Older systems may not support the latest application releases, drivers, security components, or file formats. Check the application's system requirements and install a version that supports OS X El Capitan.