![]() The above will install the original OS X that came with your computer from the factory is you use the proper shortcut keys as provided in Step 1. To install the original factory version when the computer was new use Command-Option-Shift-R.) (To install the version of OS X that was currently installed use Command-Option-R. Immediately after the chime hold down the Command-Option-SHIFT-R keys until a globe appears. If you can't use Erase All Content and Settings Erase All Content and Settings is only available in macOS Monterey or later, and only on a Mac with Apple silicon or a Mac with the Apple T2 Security Chip. You would either need a copy of the Sierra full installer application or re-download the installer from the Purchases page in App Store or have made a bootable flash drive installer for Sierra. Just press and hold the power button on your Mac until it turns off. Then you need have a way to install Sierra. I know the only way to overcome this issue is to wipe the HD clean and. ![]() It also has DeepFreeze installed and, of course, nobody knows the password. You cannot downgrade without first erasing the drive. 1 I have inherited an iMac with OS 10.6.8. ![]() Use Command-Option-Shift-R to install the original factory version when the computer was new. Use Command-Option-Rto install the version of OS X that was currently installed. Select Reinstall OS X and click on the Continue button.Quit Disk Utility and return to the Utility Menu.Click on the Apply button, then click on the Done button when it activates.Set the Format type to Mac OS Extended (Journaled.).Click on the Erase tab in Disk Utility's main window.When Disk Utility loads select the drive (usually, the out-dented entry) from the side list.Select Disk Utility and click on the Continue button.The Utility Menu will appear in from 5-20 minutes.Immediately after the chime hold down the Command-Option-R keys until a globe appears. 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?Ĭlean Install of El Capitan or Later on a Clean Disk
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