Mac Os Sierra Reset To Defualt Keychain Unable To Obtain Authorization For This Operation

macOS Recovery is part of the built-in recovery system of your Mac. You can start up from macOS Recovery and use its utilities to recover from certain software issues or take other actions on your Mac.

How to use macOS Recovery

1. Turn on your Mac and immediately press and hold Command (⌘)-R.
2. Release the keys when you see an Apple logo, spinning globe, or other startup screen.
3. You might be prompted to enter a password, such as a firmware password or the password of a user who is an administrator of this Mac. Enter the requested password to continue.
4. Startup is complete when you see the utilities window:
   
5. After starting up from macOS Recovery, select a utility, then click Continue:
   • Restore From Time Machine Backup:Restore your Mac from a Time Machine backup.
   • Reinstall macOS: Download and reinstall the Mac operating system.
   • Get Help Online: Use Safari to browse the web and find help for your Mac. Links to Apple's support website are included. Browser plug-ins and extensions are disabled.
   • Disk Utility: Use Disk Utility to repair or erase your startup disk or other storage device.
     
     Additional utilities are available from the Utilities menu in the menu bar: Startup Security Utility (or Firmware Password Utility), Network Utility, and Terminal.
6. To quit macOS Recovery, choose Restart or Shut Down from the Apple menu . If you want to choose a different startup disk before quitting, choose Startup Disk from the Apple menu.

If you don't see a Reset My Default keychain button, close the preferences window and select the “login” keychain from the left side of the Keychain Access window. Press the Delete key, then click Delete References. Choose Log Out from the Apple menu to return to the login screen. Log in to your account using your new password.

If you can't start up from macOS Recovery

If your Mac can't start up from the built-in recovery system, it might automatically try to start up from macOS Recovery over the Internet. When that happens, you see a spinning globe instead of an Apple logo during startup.

To manually start up from macOS Recovery over the Internet, press and hold Option-Command-R or Shift-Option-Command-R at startup. Learn more about these key combinations.

If your Mac still can't start up from macOS Recovery, you might need to start up from another disk or volume, or use a bootable installer.

macOS Recovery over the Internet, the Reinstall macOS utility, and the Get Help Online utility all require an Internet connection. If you need to connect to a Wi-Fi network, move your pointer to the top of the screen, then choose a network from the Wi-Fi menu in the menu bar.

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The password of your macOS user account is also known as your login password. It's the password that you use to log in to your Mac and make certain changes, such as installing software.

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Change your password

If you know your password and can use it to log in to your account, you can change your password in Users & Groups preferences:

1. Choose System Preferences from the Apple menu, then click Users & Groups.
2. Select your user name from the list of users.
3. Click the Change Password button, then follow the onscreen instructions.

Reset your password

If you don't remember your password, or it isn't working, you might be able to reset it using one of the methods described below. But first try these simpler solutions:

• Make sure that you're typing the correct uppercase or lowercase characters. If your keyboard has Caps Lock turned on, the password field shows a Caps Lock symbol .
• If the password field shows a question mark, click it to display a password hint that might help you to remember.
• Try to log in without a password. If that works, you can then add a password by following the steps to change your password.
• Try to log in with the Apple ID password that you use for iCloud. If you just changed that password and the new password isn't working, try the old password first. If that works, you should be able to use the new password from then on.

Reset using your Apple ID

In some macOS versions, you can use your Apple ID to reset your login password. At the login screen, keep entering a password until you see a message saying that you can reset your password using Apple ID. If you don't see the message after three attempts, your account isn't set up to allow resetting with Apple ID.

1. Click next to the Apple ID message, then follow the onscreen instructions to enter your Apple ID and create a new password. You'll be asked to restart when done.
2. Log in with your new password.
3. Determine whether to create a new login keychain.

Reset using another admin account

If you know the name and password of an admin account on your Mac, you can use that account to reset the password.

1. Log in with the name and password of the other admin account.
2. Choose System Preferences from the Apple menu, then click Users & Groups.
3. Click , then enter the admin name and password again.
4. Select your user name from the list of users.
5. Click the Reset Password button, then follow the onscreen instructions to create a new password:
   
6. Choose Log Out from the Apple menu.
7. Log in to your account using your new password.
8. Determine whether to create a new login keychain.

Reset using the Reset Password assistant (FileVault must be on)

If FileVault is turned on, you might be able to reset your password using the Reset Password assistant:

1. Wait up to a minute at the login screen, until you see a message saying that you can use the power button on your Mac to shut down and start up again in Recovery OS. If you don't see this message, FileVault isn't on.
2. Press and hold the power button until your Mac turns off.
3. Press the power button again to turn on your Mac.
4. When the Reset Password window appears, follow the onscreen instructions to create a new password.
   If you need to connect to Wi-Fi, move your pointer to the top of the screen and use the Wi-Fi menu to connect. To exit without resetting your password, choose Apple menu > Restart.
   
5. When done, click Restart.
6. If you were able to reset your password with the Reset Password assistant, log in to your account using your new password.
7. Determine whether to create a new login keychain.

Reset using your Recovery Key (FileVault must be on)

If FileVault is turned on and you have a FileVault Recovery Key, you can use that key to reset your password.

1. At the login screen, keep entering a password until you see a message saying that you can reset your password using your Recovery Key. If you don't see the message after three attempts, FileVault isn't on.
   
2. Click next to the message. The password field changes to a Recovery Key field.
3. Enter your Recovery Key. Use uppercase characters, and include the hyphens.
4. Follow the onscreen instructions to create a new password, then click Reset Password when done.
5. Determine whether to create a new login keychain.

If you can't log in with your new password after restarting your Mac, take these additional steps:

1. Restart again, then immediately hold down Command-R or one of the other macOS Recovery key combinations until you see the Apple logo or a spinning globe.
2. When you see the macOS Utilities window, choose Utilities > Terminal from the menu bar.
3. In the Terminal window, type resetpassword, then press Return to open the Reset Password assistant pictured above.
4. Select ”My password doesn't work when logging in,” then click Next and follow the onscreen instructions for your user account.

Create a new login keychain, if necessary

After resetting your password and logging back in to your account, you might see an alert that the system was unable to unlock your login keychain. This is expected, because the passwords for your user account and login keychain no longer match. Just click the Create New Keychain button in the alert.

If you didn't see an alert about your login keychain, or you see other messages asking for your old password, reset your keychain manually:

1. Open Keychain Access, which is in the Utilities folder of your Applications folder.
2. Choose Preferences from the Keychain Access menu, then click the Reset My Default Keychain button in the preferences window. After you enter your new password, Keychain Access creates an empty login keychain with no password. Click OK to confirm.
   If you don't see a Reset My Default keychain button, close the preferences window and select the “login” keychain from the left side of the Keychain Access window. Press the Delete key, then click Delete References.
   
3. Choose Log Out from the Apple menu to return to the login screen.
4. Log in to your account using your new password. Your account password and login keychain password now match again.

If you still can't log in

If you still can't log in with your password, contact Apple Support for help.