How to upgrade and demote Mac OS Sierra Public beta

Apple has officially pushed the beta version of iOS 10 and MacOS Serria, all of them registered to participate in the "apple beta software program, to upgrade, and the morning minority has released a detailed tutorial on the PB-level iOS, which Explain how to lift level MacOS Serria public beta.

Because the MAC's downgrade method is relatively complex and time-consuming, so before you install the beta version, please complete this tutorial, and then decide whether to be a delicacy.

Prepare: Back up your MAC

The first thing to do is to back up your computer, unless you do not care about the data in the computer, otherwise make sure to back up, do not lazy. You can choose to copy important data to a mobile hard drive, but it is more recommended to use time Machine to make a full backup of your MAC.

Upgrade MacOS Sierra Public beta

1. As with the IOS beta version, you need to first log on to the Apple Beta program website and choose MacOS in "Register your device";

2. The system will provide you with an Exchange code, click the "Exchange Code" button below will jump directly to the Mac app Store;

3. Click "Redeem" on the pop-up Mac App Store page, and the system will automatically download the MacOS beta version.

　　Note: at present, due to Apple reasons, the central MAS attempt to redeem will prompt "Redemption failure, the project is no longer available", the temporary solution is: Using the U.S. Apple ID, you can successfully redeem the download. [Registration course for the U.S. region]

Demote back to OS X El Capitan

The way to downgrade the Mac system is cumbersome, after upgrading to the beta version, you can no longer use the system "recovery mode" directly back to the formal version of the system, but also not in the Mac app Store directly download the OS X installer to install, you can only reload the system . One of the most stable and efficient way is to reload via U disk . The specific steps are as follows:

1. Back up the important files on the MAC in the cloud or on the hard drive;

2. To prepare a U disk of 8 GB or more, in the process of making system installation disk will be formatted on U disk, please make sure there is no important data in U disk;

3. Insert a U disk into the MAC, turn on the disc tool, select U drive;

4. Choose "Erase" option, and then rename the U disk to untitled and wipe off;

5. Search the Mac app Store for "os x" download OS X El Capitan installation files;

6. After downloading completes installs the program to start automatically, at this time presses the COMMAND+Q key to close installs the program;

7. Open the terminal, enter the following code in the application, confirm by carriage return;

Sudo/applications/install OS X El capitan.app/contents/resources/createinstallmedia--volume/volumes/untitled-- Applicationpath/applications/install OS X El Capitan.app--nointeraction

8. Enter the administrator password, confirm by carriage return;

9. Wait for the command to complete and display the "done.", at this time the system Startup disk production completed;

10. Restart your Mac, hear the power-on start tone after the option key, select the disk in the selection of the interface USB disk to start, by return confirmation;

11. At this time the system will enter the OS X utility, first select "Disk Utility", ready to format the hard disk;

12. In the "Disk Utility" Select the built-in hard disk, click the "Erase" option to format the hard disk;

13. After the format is completed, exit the disk tool, select "Install OS x", install the system on your internal hard drive; "

14. According to the prompts to operate, waiting for installation to complete.

Once the installation is complete, you will enter the new OS X El Capitan System, complete Setup, enter the time Machine application, and restore the previous backup from the mobile hard drive.