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
