Are you sure the SSD is locked? What do you find in Disk Utility? From what are you attempting to reinstall Sierra? Exactly how did you erase the SSD and try reinstalling macOS?
The Complete Beginners Guide to Mac OS X Sierra (Version 10.12): (For MacBook, MacBook Air, MacBook Pro, iMac, Mac Pro, and Mac Mini) La Counte, Scott on Amazon.com.FREE. shipping on qualifying offers. The Complete Beginners Guide to Mac OS X Sierra (Version 10.12): (For MacBook, MacBook Air, MacBook Pro, iMac, Mac Pro. R/osx: Reddit's community for users, developers, and hackers of Mac OS X – the desktop operating system from Apple Press J to jump to the feed. Press question mark to learn the rest of the keyboard shortcuts.
Clean Install of El Capitan or Later on a Clean Disk
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Use Command-Option-Rto install the version of OS X that was currently installed. Use Command-Option-Shift-R to install the original factory version when the computer was new.
Check compatibility
You can upgrade to macOS High Sierra from OS X Mountain Lion or later on any of the following Mac models. Your Mac also needs at least 2GB of memory and 14.3GB of available storage space.
MacBook introduced in late 2009 or later
MacBook Air introduced in late 2010 or later MacBook Pro introduced in mid 2010 or later Mac mini introduced in mid 2010 or later iMac introduced in late 2009 or later Mac Pro introduced in mid 2010 or later
To find your Mac model, memory, storage space, and macOS version, choose About This Mac from the Apple menu . If your Mac isn't compatible with macOS High Sierra, the installer will let you know.
Make a backup
Before installing any upgrade, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.
Get connected
It takes time to download and install macOS, so make sure that you have a reliable Internet connection. If you're using a Mac notebook computer, plug it into AC power.
Download macOS High Sierra
For the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of the Mac operating system.
If you still need macOS High Sierra, use this App Store link: Get macOS High Sierra.
Mac Os X El Capitan![]() Begin installation
After downloading, the installer opens automatically.
Download Mac Os High Sierra
Click Continue and follow the onscreen instructions. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed.
If the installer asks for permission to install a helper tool, enter the administrator name and password that you use to log in to your Mac, then click Add Helper.
Allow installation to completeR For Mac Os X Sierra Download
Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs both macOS and related updates to your Mac firmware.
R For Mac Os X Sierra 10 12Learn moreMac Os X Sierra Dmg
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