How to roll back from macOS Sierra to OS X El Capitan?

While the macOS Sierra upgrade does not create a barrier for most Mac users, there are some exceptions where users may experience a series of issues after the Sierra upgrade. 

Even after reinstalling Sierra, these issues may persist. For these users, the only viable option is to roll back from Sierra to the previous version, such as OS X 10.11 El Capitan.

There is no time limit in iOS, and users must complete this rollback process. So if you want to do this process, you can do anything anytime, anywhere. 

However, before downgrading, you must back up the files you added after the Sierra upgrade.

Note: 

Do not continue to roll back unless you have a Time Machine backup of El Capitan. Here's how to back up your Mac before installing macOS Sierra.

How to roll back from Sierra to El Capitan?

1.    Erase macOS Sierra with the disk utility.

2.    Reinstall OS X El Capitan.

3.    Restore data from the El Capitan Time Machine backup.

Wipe your macOS Sierra

1.    Click the Apple logo in the top left corner of the screen and select Restart.

2.    Hold down Command + R when your Mac restarts.

3.    Select the disk utility from the OS X utility.

4.    Select your Mac Sierra boot disk and click Clear.

Once you have cleared your macOS Sierra, you can continue to reinstall OS X El Capitan.

How to reinstall El Capitan on Mac

1.    Restart your Mac and use Command + R to open the OS X utility.

2.    Choose to reinstall OS X.

3.    Click Continue on the OS X El Capitan installer.

4.    Continue to install.

carry out! You have completed the rollback process. Now you only need to use Time Machine Backup to recover your El Capitan data.

Recover data from Time Machine Backup

1.    Select Time Machine Backup from the OS X utility.

2.    Click the " Restore " option.

3.    When the " Restore System " window appears, click " Continue ".

4.    Choose your time machine backup.

5.    If there are multiple backups, select the most recent backup.

Please be patient, depending on your network bandwidth and data transfer volume.