Proceeding Back Mac OS

Power on your Mac and press and hold the following keys at the same time: Shift + Option + ⌘ + R. Your Mac will power on and boot into internet recovery mode. In the macOS Utilities window, click Reinstall macOS. Click Continue and follow the instructions to install the version of macOS that shipped with your Mac. Step 2: Boot Mac in the Recovery Mode. Once you have taken a backup of your Mac data, you need to restart in the recovery mode. The Mac Recovery Mode is a dedicated module in the operating system that provides all kinds of firmware and disk-related options. Use the System Disk app to set booting into OS 9. The other, quick-and-dirty, way to do it is to hold down the Option key at startup. This is a pain in the ass, though, because you have to wait for OS X to cycle through all the potential Systems (this is a holdover from OS X Server). To see the size of a specific file or folder, click it once and then press Command-I. Macos sierra 10 13 6 download. To see storage information about your Mac, click the Apple menu in the top-left of your screen. Choose About This Mac and click the Storage tab. For Time Machine backups, it's good to use a drive that has at least twice the storage capacity of your Mac.

1. Proceeding Back Mac Os Download
2. Proceeding Back Mac Os X
3. Proceeding Back Mac Os Catalina
4. Proceeding Back Mac Os 11

How To (Re)install Mac OS X

• If you can, make sure you have a full, current backup or clone of your system/setup.
• Make sure you have your original Mac OS X installation disc(s). This will either be a 'retail' disc or the original discs that came with your computer.
• Alternatively you could have an external installation device e.g. having used Apple's Lion Disk Recovery Assistant or you have an official Apple Lion USB thumb drive.
• If the Mac OS version that you are reinstalling does not have the printer drivers you need included make sure you have the installer for them.
• List of printer drivers included with Mac OS X 10.4
• List of printer drivers included with Mac OS X 10.5
• List of printer and scanner drivers included with Mac OS X 10.6
• List of printer and scanner drivers included with OS X 10.7 and later
• Other items you may need to reinstall so make sure you have the installers/updaters available and ready:
• USB/FireWire drivers (for external hardware)
• Software that installs Kernel Extensions (KEXTS)

Explanation of Different Install Methods:

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• Erase and Install = (Automatically) erases the hard disk first, then installs Mac OS X - this method deletes all your personal data and applications!
• Install Mac OS X for the first time = This is basically the same as the 'Erase and Install' method but where you manually erase the hard disk first or you are installing to an empty hard disk.
• Archive and Install = Available in Mac OS X 10.2 and later (except with 'Upgrade' discs), an Archive and Install installation automatically moves existing system files to a folder named Previous System, then installs Mac OS X again. You cannot start up your computer using a Previous System folder, nor can you 're-bless' the Previous System folder. You can choose to preserve your user and network settings before installing. This option automatically moves existing users, Home directories, and network settings. This also skips the Setup Assistant after installation. (see this Apple article.)
• Restore system = This option is referred to when you are using discs that originally came with your computer (see this Apple article). Using 'restore' discs usually gives you similar options to the above three types but with the addition of installing extras like iLife applications at the same time.
• Upgrade Install = This option is usually available when you are installing a newer version of Mac OS X on a disk that has an older version on it or you have an 'Upgrade' disc.

Instructions For Installing Mac OS X

Install Method Instructions In This Article:

• Archive and Install for OS X 10.7 or later - using:
• an Install DVD
• an official Apple Lion USB thumb drive
• an External Installation Device (but not an Apple Recovery Disk created with the Recovery Disk Assistant)
• Archive and Install for OS X 10.7 or later - using a 'Recovery HD' or Apple Recovery Disk
• Archive and Install for OS X 10.7 or later - using your computer's 'Internet Recovery Mode'
• Archive and Install for OS X 10.7 or later - using an OS X Install installer application from the Mac App Store
• Erase Install for Mac OS X 10.2, 10.3, 10.4, 10.5 or 10.6
• Erase Install for OS X 10.7 or later - using:
• an Install DVD
• an official Apple Lion USB thumb drive
• an External Installation Device (but not an Apple Recovery Disk created with the Recovery Disk Assistant)
• Erase Install for OS X 10.7 or later - using a 'Recovery HD' or Apple Recovery Disk
• Erase Install for OS X 10.7 or later - using your computer's 'Internet Recovery Mode'

Instructions for the Archive and Install method (Mac OS X 10.2, 10.3, 10.4, 10.5)

1. Start up from the Mac OS X Install volume
NOTE: Usually, you can start from an install disc by putting it in your computer, restarting, and holding down the C key or you may be able to hold down Option and choose the install disc from the Startup Manager.
2. Select your language. Click the forward arrow button.
3. The Welcome to the Mac OS X Installer window appears. Click Continue.
4. The Important Information window appears. After reading or printing the information, click Continue.
5. The Software License Agreement window appears. After reading or printing the information, click Continue.
6. An agreement sheet appears. If you agree with the license agreement, click Agree.
7. The Select a Destination window appears. Click the volume that you wish to install to.
8. Click Options. The installation options sheet appears.
9. Select 'Archive and Install'.
10. You should also select/tick 'Preserve Users and Network Settings'.
11. Click OK.
12. Check the volume your are installing to is the correct one.
13. Click Continue to begin the installation.
14. When OS X has installed and the computer has restarted you should now install the required Mac OS X Combo update that you need
• List of Mac OS X 10.3 Combo Updates
• List of Mac OS X 10.4 Combo Updates
• List of Mac OS X 10.5 Combo Updates
15. Once the required combo update is installed keep going to Apple menu > Software Update to install all other required updates.
NOTE: If you are reinstalling your system to avoid a Mac OS X update bug remember to use the Combo update for the version before and then when running Software Update to untick the version of Mac OS X that you don't want.
16. When you are happy everything is installed and running okay and you have rescued anything you need from the 'Previous System' folder you can delete the 'Previous System' folder.

Instructions for the Archive and Install method (Mac OS X 10.6)

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1. Start up from the Mac OS X Install volume
NOTE: Usually, you can start from an install disc by putting it in your computer, restarting, and holding down the C key or you may be able to hold down Option and choose the install disc from the Startup Manager.
2. Select your language. Click the forward arrow button.
3. The Welcome to the Mac OS X Installer window appears. Click Continue.
4. The Important Information window appears. After reading or printing the information, click Continue.
5. The Software License Agreement window appears. After reading or printing the information, click Continue.
6. An agreement sheet appears. If you agree with the license agreement, click Agree.
7. The Select a Destination window appears. Click the volume that you wish to install to.
8. Click Continue to begin the installation.
9. When OS X has installed and the computer has restarted you should now install the required Mac OS X Combo update that you need
• List of Mac OS X 10.6 Combo Updates
10. Once the required combo update is installed keep going to Apple menu > Software Update to install all other required updates.
NOTE: If you are reinstalling your system to avoid a Mac OS X update bug remember to use the Combo update for the version before and then when running Software Update to untick the version of Mac OS X that you don't want.

Instructions for the Archive and Install method (OS X 10.7 or later) - using one of the following

• an Install DVD
• an official Apple Lion USB thumb drive
• an External Installation Device (but not an Apple Recovery Disk created with the Recovery Disk Assistant)

1. Start up from the Mac OS X Install volume
NOTE: Usually, you can start from an install disc by putting it in your computer, restarting, and holding down the C key or you may be able to hold down Option and choose the install disc from the Startup Manager.
2. The Mac OS X Utilities window reappears.
3. Select 'Reinstall Mac OS X' and click Continue.
4. The Install Mac OS X window appears. Click Continue.
5. The Software License Agreement window appears. After reading or printing the information, click Agree.
6. An agreement sheet appears. If you agree with the license agreement, click Agree.
7. The Select the disk where you want to install Mac OS X window appears. Click the volume that you wish to install to.
8. Check the volume you are installing to is the correct one.
9. Click Install to begin the installation.
10. When OS X has installed and the computer has restarted you should now install the required Mac OS X Combo update that you need
• List of OS X 10.7 Combo Updates
• List of OS X 10.8 Combo Updates
11. Once the required combo update is installed keep going to Apple menu > App Store… > Updates to install all other required updates.
NOTE: If you are reinstalling your system to avoid a Mac OS X update bug remember to use the Combo update for the version before and then when running Software Update to untick the version of Mac OS X that you don't want.

Instructions for the Archive and Install method (OS X 10.7 or later) - using an OS X Install installer application from the Mac App Store

1. Copy the OS X Install installer application to your hard disk/Applications folder
2. Double click the OS X Install installer application.
3. The Install Mac OS X window appears. Click Continue.
4. The Software License Agreement window appears. After reading or printing the information, click Agree.
5. An agreement sheet appears. If you agree with the license agreement, click Agree.
6. The Select the disk where you want to install Mac OS X window appears. Click the volume that you wish to install to.
7. Check the volume you are installing to is the correct one.
8. Click Install to begin the installation.
9. When OS X has installed and the computer has restarted you should now install the required Mac OS X Combo update that you need
• List of OS X 10.7 Combo Updates
• List of OS X 10.8 Combo Updates
10. Once the required combo update is installed keep going to Apple menu > App Store… > Updates to install all other required updates.
NOTE: If you are reinstalling your system to avoid a Mac OS X update bug remember to use the Combo update for the version before and then when running Software Update to untick the version of Mac OS X that you don't want.

Proceeding Back Mac Os Catalina

Instructions for the Erase and Install method or installing Mac OS X for the first time
(Mac OS X 10.2, 10.3, 10.4, 10.5, 10.6)

1. Start up from the Mac OS X Install volume
NOTE: Usually, you can start from an install disc by putting it in your computer, restarting, and holding down the C key or you may be able to hold down Option and choose the install disc from the Startup Manager.
2. Select your language. Click the forward arrow button.
3. The Welcome to the Mac OS X Installer window appears.
4. The Important Information window appears.
5. If you are going to manually erase your hard disk and then Install Mac OS X for the first time:
1. Go to the Utilities menu and select 'Disk Utility'.
2. Format your hard disk.
3. Quit Disk Utility.
4. The Important Information window reappears.
6. After reading or printing the Important Information, click Continue.
7. The Software License Agreement window appears. After reading or printing the information, click Continue.
8. An agreement sheet appears. If you agree with the license agreement, click Agree.
9. The Select a Destination window appears. Click the volume that you wish to install to.
10. If you have not manually erased your hard disk:
1. Click Options. The installation options sheet appears.
2. Select 'Erase and Install'.
3. Select the format for the disk you are automatically erasing (usually 'Mac OS Extended' for Mac OS X 10.2 / 'Mac OS Extended (Journaled)' for Mac OS X 10.3 and later).
4. Click OK.
11. Check the volume you are installing to is the correct one.
12. Click Continue to begin the installation.
13. When OS X has installed and the computer has restarted you should now install the required Mac OS X Combo update that you need
• List of Mac OS X 10.3 Combo Updates
• List of Mac OS X 10.4 Combo Updates
• List of Mac OS X 10.5 Combo Updates
• List of Mac OS X 10.6 Combo Updates
14. Once the required combo update is installed keep going to Apple menu > Software Update to install all other required updates.
NOTE: If you are reinstalling your system to avoid a Mac OS X update bug remember to use the Combo update for the version before and then when running Software Update to untick the version of Mac OS X that you don't want.

Instructions for the Erase and Install method (OS X 10.7 or later) - using

• an Install DVD
• an official Apple Lion USB thumb drive
• an External Installation Device (but not an Apple Recovery Disk created with the Recovery Disk Assistant)

1. Start up from the OS X Install volume
NOTE: Usually, you can start from an install disc by putting it in your computer, restarting, and holding down the C key or you may be able to hold down Option and choose the install disc from the Startup Manager.
2. The OS X Utilities window appears.
3. Select 'Disk Utility' and click Continue.
4. Format your hard disk.
5. Quit Disk Utility.
6. The OS X Utilities window reappears.
7. Select 'Reinstall OS X' and click Continue.
8. The Install OS X window appears. Click Continue.
9. The Software License Agreement window appears. After reading or printing the information, click Agree.
10. An agreement sheet appears. If you agree with the license agreement, click Agree.
11. The Select the disk where you want to install OS X window appears. Click the volume that you wish to install to.
12. Check the volume you are installing to is the correct one.
13. Click Install to begin the installation.
14. If you installed OS X via the internet you will have automatically installed the latest version of OS X. If you installed it from a backup of the OS X installer you may need to install the latest OS X Combo update:
• List of macOS 11 Combo Updates (latest version = 11.3)
• List of macOS 10.15 Combo Updates (latest version = 10.15.7)
• List of macOS 10.14 Combo Updates (latest version = 10.14.6)
• List of macOS 10.13 Combo Updates (latest version = 10.13.6)
• List of macOS 10.12 Combo Updates (latest version = 10.12.6)
• List of OS X 10.11 Combo Updates (latest version = 10.11.6)
• List of OS X 10.10 Combo Updates (latest version = 10.10.5)
• List of OS X 10.9 Combo Updates (latest version = 10.9.5)
• List of OS X 10.8 Combo Updates (latest version = 10.8.5)
• List of OS X 10.7 Combo Updates (latest version = 10.7.5)
NOTE: Apple software updates/installers downloaded prior to 14th February 2016 have an expired security certificate. You should re-download any required/archived updates/installers.
15. Once OS X (and any combo update) is installed keep going to Apple menu > App Store… > Updates to install all other required updates.
NOTE: If you are reinstalling your system to avoid a OS X update bug remember to use the Combo update for the version before and then when running Software Update to untick the version of OS X that you don't want.
NOTE: If your computer came with OS X 10.7 Lion or later your iLife applications have to be downloaded separately via the Mac App Store afterwards.

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How to start up in macOS from Windows

Proceeding Back Mac Os 11

1. From the notification area on the right side of the Windows taskbar, click to show hidden icons.
2. Click the Boot Camp icon .
   
3. From the menu shown, choose Restart in macOS.
   If you haven't installed the latest Boot Camp updates, you might get the message 'Could not locate the OS X boot volume.'
   

Or use Startup Manager as your Mac starts up:

1. Restart your Mac from the Start menu in Windows.
2. Press and hold the Option (or Alt) ⌥ key as your Mac begins to restart.
3. Select your Mac startup volume (Macintosh HD) in the Startup Manager window, then press Return or click the up arrow:
   

How to start up in Windows from macOS

• Use Startup Manager to choose your Windows (Boot Camp) volume during startup.
• Or select your Boot Camp volume in Startup Disk preferences, then restart.

Learn more

• If you're having difficulty using VoiceOver or another screen reader to complete these steps, please contact Apple Support.
• Learn how to install Windows 10 on your Mac.