Install Os X Recovery Mode


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:

An error occurred while preparing the installation. Try running again

Click Disk Utility when in macOS Recovery. Click on your Mac's startup drive in the Disk Utility sidebar. It should be the drive at the top of the sidebar if there are multiple drives. Click First Aid. First Aid will run, checking the health of your Mac's drive. This process could take a little while. Reinstalling macOS Big Sur from Recovery Mode. Now that you have entered Recovery Mode on your Mac, it is time to reinstall the OS of the computer. From the Utilities screen of the macOS Recovery, select the Reinstall option and click on Continue. Follow the on-screen instructions and steps – they will guide you through the whole process.

Now, if you haven’t used your Mac for a while, the error might be caused by an incorrect system date setting. You can check this by going to utilities and opening the terminal. Once in the terminal enter the following command and hit return/enter:

The result of this command will be the date that the system currently has been set to. For some reason, it might have been reset to 2001, in which case we need to set it to the right date. To do this, we enter a new command. This command will be entered as follows:

Every bracket should be replaced with a two-digit number based on UTC time. Below you see what the command should be for your current time and date – . To avoid trouble with timezones, we will use UTC time instead (). Which means, you can just enter it exactly like this:

Enter the command and hit return. You can then check if it was set correctly by running the first command again. 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.

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