How to create a bootable USB flash drive to install the MacOS Sierra
Tips Macos / / December 19, 2019
The official release announced at the WWDC-2016 macOS Sierra will be held only in the fall, but the first beta version for developers is already available. All those who can not wait to look at the new MacOS, can install it now. We tell how to do it and how to revert to OS X El Capitan, if something goes wrong.
There are two ways: an update of the current operating system, and a clean installation by using a boot disk. Since this is a beta version and it is already enough bugs, it is better to use the second method.
Before you start, be sure to make a backup of Time Machine, which will help to quickly restore your the Mac, if you want to return everything as it was. We will need the installation image, pure USB-flash drive (minimum 8 GB) and a compatible Mac. The image can be downloaded from torrents, flash card you probably have, as well as Mac. Getting Started!
MacOS Sierra maintained MacBook Pro (from 2010), MacBook Air (from 2010), Mac mini (from 2010), Mac Pro (from 2010), MacBook (from 2009), iMac (from 2009).
How to create a bootable USB flash drive
- Open the image macOS Sierra and copy files from it Install 10.12 Developer Preview.app.
- Plug your USB flash drive to the Mac (remember, all data on the flash drive will be deleted).
- Rename it in SierraInstaller.
- Open the "Terminal", copy the following command, and confirm the administrator password:
sudo / Applications / Install \ macOS \ Sierra.app/Contents/Resources/createinstallmedia --volume / Volumes / SierraInstaller --applicationpath / Applications / Install \ macOS \ Sierra.app --nointeraction && say Done
- Begin the process of creating a boot disk, which will take about 15 minutes.
Erasing Disk: 0%... 10%... 20%... 30%...100%... Copying installer files to disk... Copy complete. Making disk bootable... Copying boot files... Copy complete. Done.
- Once complete, you'll see (and hear) a confirmation that everything was successful. Your bootable flash drive is ready!
Now will restart the Mac, hold down the Option key, choose from the list of boot flash drive disk with MacOS Sierra and follow the prompts of the installation wizard.
How to revert to OS X El Capitan
Do not operate programs that you need, is infinitely fly error, or you just have already satisfied their curiosity and want to return it back? Nothing could be easier.
For this we need a bootable flash drive - as you've probably guessed - with OS X El Capitan. It is created in the same way, you can find detailed instructions here.
And then - the same principle as when you install any version of OS X: Boot while holding the Option key and the connected USB flash drive, select it in the list and follow the prompts of the installation wizard.
When put macOS Sierra, share your impressions in the comments and tell me how you new chips!