Being with macOS Sierra probably makes you disappointed especially when this new Mac OS X 10.12 is still in Beta version. How to get back to El Capitan after upgrading to macOS Sierra?
The processes to downgrade MacOS Sierra
To Downgrade macOS Sierra to El Capitan, Yosemite or another Mac OS X version, you have to following the below steps.
Step 1. You have to Erase the macOS Sierra from your Mac
Step 2. You have to Re-install El Capitan or any another Mac OS X versions
How to remove completely the installed macOS Sierra from your Mac?
- Reboot your Mac, then keep holding down the combination of Command + R keys until the familiar Apple Logo appears on the screen to go to the Recovery mode.
- From the OS X utilities menu, choose Disk Utility
- Choose the startup disk from the left side of the Disk Utility window, then click the Erase tab.
- You now have to type in Macintosh HD for the name (Or anything you like) as Mac OS Extended from the format list and then choose Erase.
After you have erased macOS Sierra, you have to quit Disk Utility and start reinstalling OS X El Capitan or another particular Mac OS X version.
Reinstall El Capitan
- Restart the Mac. While your Mac reboots, you need to hold down Command+R to go to the Recovery mode again.
- If you had made a full backup using Time Machine Backup before, just click on Restore from Time Machine Backup from the OS X Utilities menu, then choose the Time Machine backup disk to choose the right Backup you want to restore from, then click Continue. Now, let the restoring process be completed. Depending on the network speed or amount of data, it will take some good time
Otherwise, you may want to take a look on Guide to install Mac OS X 10.11 El Capitan at a new OS.