If the date was wrong, it was likely that which caused the error, and after you quit the terminal it should be able to install OS X just fine. You can then check if it was set correctly by running the first command again. Which means, you can just enter it exactly like this: date -uĮnter the command and hit return. When you see the macOS Utilities below, it indicates that Command-R has successfully led you into Mac Recovery Mode. Release the keys until you see the Apple logo on the screen.

Reboot your Mac computer and simultaneously press down the Command-R keys. To avoid trouble with timezones, we will use UTC time instead (). Here's how to use Command R to reinstall macOS: Completely shut down your Mac. When cooked, remove SSD from Mac and insert into mac mini. Insert flash drive with bootable OS ( icon appears on desktop) Click on OS icon.

Disc Utility Erase SSD, then partition SSD and give it a name. Below you see what the command should be for your current time and date –. How do I install macOS Sierra on a new SSD Connect SSD via SATA cable to a Mac. This command will be entered as follows: date -u Įvery bracket should be replaced with a two-digit number based on UTC time. For some reason, it might have been reset to 2001, in which case we need to set it to the right date. The result of this command will be the date that the system currently has been set to. Once in the terminal enter the following command and hit return/enter: date You can check this by going to utilities and opening the terminal. Now, if you haven’t used your Mac for a while, the error might be caused by an incorrect system date setting. When you’re booting your Mac from the recovery partition and are planning to reinstall OS X, you might be met by the following message:Īn error occurred while preparing the installation. March 2013 Changing system date from Terminal – OS X recovery

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