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:
To change the date from Terminal (which is likely all that will be accessible), follow these steps, which set it to 1 February 2016: In the installer, choose Utilities Terminal. Enter sudo date, press Return, and enter your password. Quit Terminal and continue the install.
How can change Date from Command Line in mac OSXSetting the DateNow, if you need to set the date on your system to the current correct date, you'll need to k. It is (weirdly) controlled by two keys: com.apple.autologout.AutoLogOutDelay. You have to set both for it to appear correctly in the System Preferences (which you also have to quit and relaunch to get it to pick up updated settings). To view the current setting (if there is one).
An error occurred while preparing the installation. Try running again
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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Passwords for all user accounts can be reset and changed when booted from the Recovery Partition on OS X.
El Capitan Apple
This tutorial can be used for OS X 10.11 El Capitan, OS X 10.10 Yosemite, OS X 10.9 Mavericks and OS X 10.8 Mountain Lion.
Mac El Capitan Iso
Step 1. Netcat tool. Boot into Recovery Partition
When booting starts press command + R and hold until you see startup screen
El Capitan Software Download
Step 2. Go to Utilies>Terminal
Step 3. Insert command “resetpassword” and hit enter (For those that cannot see hard drive insert command “mount –uw /” first)
Step 4. On Reset password screen, select the volume hard drive and user account that you need to reset password. Type 2 times new password and hint and press Save.
You will get confirmation screen and details about the keychain account.
This procedure don’t reset Keychain password, you will need old password to open it or to create new one.