If you find the need to make a downgrade to OS X macOS Sierra El Capitan because you have found stability problems in the system and would like to regain the stability of your Mac, you've come to the right place.
There are different ways to uninstall and re Sierra MacOS OS X El Capitan, the three main methods are:
- In the case of dual boot MacOS and Sierra have OS X El Capitan, simply delete the partition of macOS Sierra, leaving El Capitan as the primary operating system.
- Perform a clean installation of OS X El Capitan of erasing the Mac disk and install the operating system, finally restoring from a backup of important files you had previously in the previous SO
- Returning to El Capitan by restoring from a backup made with Time Machine before installing macOS Sierra. The following tutorial will be based on the latter method.
Since this requires a backup Time Machine to restore OS X El Capitan and remove Mac OS Sierra, obviously this method will not work if you do not have a backup Time Machine made before installing Sierra.
MacOS to downgrade to OS X Sierra El Capitan backup with Time Machine:
- Place the disk Time Machine for Mac if you have not already done so.
- Restart your Mac and hold down Command + R.
- On the screen "Utilities" choose "Restore from Backup Time Machine"
- Select the backup for OS X El Capitan (10.11.x) made before installing Mac OS Sierra and then click "Continue"
- Select the destination drive to restore.
- Let the time machine complete the restoration process.
- When you restart the Mac, OS X El Capitan is executed and displayed as they stood on the corresponding date from the last backup made of El Capitan.