Quick Answer
You can install macOS from Recovery Mode by starting your Mac in macOS Recovery, connecting to the internet, and choosing Reinstall macOS from the Recovery window. This normally reinstalls the current version of macOS without deleting your personal files, apps, or user accounts.
Recovery Mode is useful when your Mac cannot start normally or when a regular update through System Settings is unavailable. However, Reinstall macOS is not always the same as installing a small point update. It may reinstall the macOS version already associated with the Mac or install the latest compatible version, depending on how you start Recovery and which Mac you use.
Back up your Mac if possible before continuing. Although reinstalling macOS is designed to preserve your data, interruptions or drive problems can still create a risk.
When to Use Recovery Mode for a macOS Update
Installing macOS from Recovery Mode can help when:
- Your Mac is stuck during startup.
- macOS will not load far enough to open System Settings.
- A normal macOS update repeatedly fails.
- Important system files may be damaged.
- You need to reinstall macOS after repairing the startup disk.
- You want to use Apple’s built-in recovery environment instead of a bootable installer.
If your Mac starts normally, the safer and simpler method is usually System Settings > General > Software Update. Recovery Mode is primarily a repair and reinstallation environment, not a replacement for every regular macOS update.
Before using it, disconnect unnecessary external drives and accessories. Leave connected only devices you need, such as a wired keyboard, mouse, or power adapter. If you are using a Mac notebook, connect its power adapter.
Before You Start
Back up your files
If macOS still starts, back up your important files before entering Recovery Mode. Use Time Machine, iCloud, or another backup method. At minimum, copy irreplaceable documents, photos, and other files to a separate storage location.
Do not assume that reinstalling macOS makes a backup unnecessary. The reinstall process is intended to preserve user data, but a failing internal drive, power loss, or an incorrect erase operation can still cause data loss.
Check your internet connection
Recovery Mode usually needs an internet connection to download macOS or required recovery components. Wi-Fi may work, but a wired Ethernet connection can be more reliable if available.
Have your Wi-Fi password ready. Some Recovery Mode tools may display a globe or network prompt before the main Recovery window appears.
Know which type of Mac you have
The startup procedure differs between:
- Apple silicon Mac: Mac models with an M-series chip.
- Intel-based Mac: Older Macs with an Intel processor.
If you are unsure, you can check when macOS is running by opening the Apple menu and selecting About This Mac. If the Mac will not start, try the Apple silicon procedure first only if you know the Mac has an Apple silicon chip; otherwise use the Intel procedure.
Start a Mac in macOS Recovery
Apple silicon Mac
- Shut down the Mac completely. If it is frozen, press and hold the power button until it turns off, but be aware that unsaved work may be lost.
- Press and hold the power button.
- Release the button when Loading startup options appears.
- Select Options.
- Click Continue.
- Select an administrator account if prompted, then enter its password.
The macOS Recovery window should appear. It may be titled macOS Recovery and include tools such as Restore from Time Machine, Reinstall macOS, Safari, and Disk Utility.
Intel-based Mac
- Shut down the Mac. If you force it to turn off because it is unresponsive, unsaved work may be lost.
- Press the power button, then immediately press and hold Command (⌘)-R.
- Release the keys when you see the Apple logo or a rotating globe.
- Select a Wi-Fi network if prompted.
- Choose an administrator account and enter its password if requested.
The standard Command-R shortcut starts the built-in Recovery system. On some Intel Macs, other startup key combinations can provide different recovery options, but use the standard shortcut first unless you have a specific reason to use another method.
If Recovery does not load, see How to Fix macOS Recovery Not Loading.
Install macOS from Recovery Mode
The following process reinstalls macOS over the existing system. Do not choose Disk Utility > Erase unless you intentionally want to erase the Mac. Erasing the startup disk deletes data and may remove the existing operating system.
- Start the Mac in macOS Recovery using the appropriate steps above.
- In the Recovery window, select Reinstall macOS.
- Click Continue.
- Read the information on screen, then click Continue again if required.
- Review the software license agreement and click Agree.
- Select the startup disk when asked where to install macOS. It is often named Macintosh HD, but the name may be different.
- Click Install or Continue, depending on the screen shown.
- Enter an administrator password if prompted.
- Leave the Mac connected to power and connected to the internet while the installer runs.
The Mac may restart several times. The screen can remain blank or show a progress bar for an extended period. Do not shut down the Mac while the installation is in progress unless it has clearly frozen for a very long time and you have checked Apple’s current support guidance.
When installation finishes, macOS should start normally. You may need to sign in, reconnect to Wi-Fi, approve terms, or complete a short setup process.
Does Recovery Mode Install the Latest macOS Update?
Not necessarily. The version installed by Recovery depends on the Mac, the Recovery method, and Apple’s available installation environment.
Recovery Mode may:
- Reinstall the current macOS version already installed.
- Install the latest compatible major version available through that recovery process.
- Restore core macOS system files without changing personal files.
If you need a specific newer version, first try System Settings > General > Software Update when macOS can start. If the desired update does not appear, the Mac may not support it, the update may not be available for that model, or the Mac may need additional troubleshooting.
Recovery Mode is best understood as a way to reinstall macOS and repair startup problems—not as a guaranteed method for forcing a particular macOS release.
Optional: Check the Startup Disk Before Reinstalling
If the Mac will not start because of file-system errors, reinstalling macOS may not solve the underlying problem. You can check the startup disk with Disk Utility first.
- In the Recovery window, select Disk Utility.
- Click Continue.
- Select View > Show All Devices from the menu bar.
- Select the internal storage volume, usually Macintosh HD.
- Click First Aid.
- Click Run and wait for the check to finish.
- If appropriate, repeat First Aid for related volumes or the internal physical disk, following the order and instructions shown by Disk Utility.
- Quit Disk Utility.
- Return to the Recovery window and select Reinstall macOS.
First Aid checks and repairs certain directory and file-system problems. It does not replace a backup and cannot repair every hardware failure. For more detailed instructions, see How to Repair a Mac Startup Disk in macOS Recovery.
Warning: Do not click Erase unless you deliberately plan to delete the selected volume. Erasing the wrong disk or volume can permanently remove files.
What Happens to Your Files?
Choosing Reinstall macOS without erasing the startup disk is normally intended to keep:
- Personal files
- User accounts
- Installed applications
- Photos and documents
- Most settings
However, there are important limitations:
- A failing drive may lose data during the process.
- An interrupted installation can leave macOS unable to start.
- Erasing the disk beforehand deletes data.
- Some applications may need updates or reinstallation after macOS is reinstalled.
- A firmware, storage, or hardware problem may prevent installation from completing.
If Recovery asks you to select a disk and you see only an erase option, stop and verify what you are doing before continuing. Do not erase the disk simply because the installation cannot find it.
Troubleshooting macOS Installation from Recovery
Reinstall macOS is missing
If Reinstall macOS does not appear, confirm that you are in the main Recovery window rather than inside Disk Utility or another tool. Quit the current app to return to the Recovery utilities.
If the option is still unavailable, restart into Recovery again. On an Intel Mac, verify that you used Command-R immediately after pressing the power button. On an Apple silicon Mac, hold the power button until startup options appear and choose Options.
The startup disk does not appear
A missing startup disk can indicate a volume problem, an unmounted volume, encryption requiring an account password, or a hardware issue.
Open Disk Utility, select View > Show All Devices, and check whether the internal drive or Macintosh HD appears. If the disk appears but is not mounted, select the volume and click Mount, if that option is available. Then quit Disk Utility and try the reinstall again.
If First Aid reports that it cannot repair the disk, do not erase it unless you have a current backup and intend to perform a clean installation. A serious storage problem may require professional service.
The download fails
Check that the Mac is connected to a stable network. If possible, move closer to the Wi-Fi router or use Ethernet. Restart Recovery Mode and try again.
A network that requires a browser sign-in page, such as some hotel or public networks, may not work reliably in Recovery. Use a private network when possible.
Installation stops or shows an error
Write down the exact error message. Then:
- Restart the Mac into Recovery Mode.
- Run Disk Utility > First Aid on the startup disk.
- Confirm that the Mac has a stable internet connection.
- Try Reinstall macOS again.
- Disconnect unnecessary external devices.
If the same error returns, the internal storage, installation environment, or hardware may need further diagnosis. Repeatedly erasing the disk is not a general solution and can destroy data.
The Mac starts in Recovery every time
If the Mac returns to Recovery after installation, remove external drives and restart. Check whether the startup disk is selected as the startup disk in Recovery’s startup options or Disk Utility environment.
A Mac that repeatedly starts in Recovery may have a damaged system, an unrecognized startup disk, or a hardware problem. See How to Fix a Mac That Starts in macOS Recovery Instead of macOS for additional startup troubleshooting.
The Mac appears frozen during installation
Installation can pause while files are verified, the system restarts, or the progress display updates. Give it time and keep the Mac connected to power.
If there is no visible progress for an unusually long period and the Mac does not respond, press and hold the power button to shut it down only as a last resort. This can interrupt installation and may require another Recovery attempt.
Frequently Asked Questions
Does reinstalling macOS from Recovery delete everything?
Not when you choose Reinstall macOS and install over the existing startup volume without erasing it. Nevertheless, back up first because drive failures, interruptions, and accidental use of Erase can cause data loss.
Can I install a macOS update if my Mac will not start?
Often, yes. Recovery Mode can download and reinstall macOS even when the normal system cannot load. The Mac still needs compatible hardware, a usable startup disk, and an internet connection.
Should I use Recovery Mode or Software Update?
Use Software Update for routine updates when macOS starts normally. Use Recovery Mode when macOS will not start, Software Update fails repeatedly, or you need to replace damaged system files.
Will Recovery Mode install the newest macOS version?
It may not. Recovery installs the version made available for that Mac and recovery method. To install a specific newer release, check System Settings > General > Software Update first and confirm that the Mac supports it.
Can I use Recovery Mode without Wi-Fi?
Recovery features such as Disk Utility may work without internet access, but reinstalling macOS generally requires the Mac to download installation files. A wired connection or a reliable Wi-Fi network is recommended.
Is First Aid required before reinstalling macOS?
No. If the startup disk is visible and the Mac simply needs macOS reinstalled, you can proceed directly. First Aid is useful when the Mac has startup errors, the disk is missing, or the installer reports a disk problem.
Final Thoughts
Recovery Mode can reinstall macOS when a normal update is unavailable or the Mac cannot start. Use Reinstall macOS, avoid Erase unless you intentionally want a clean installation, keep the Mac connected to power and the internet, and back up important files before beginning. If the disk is not detected or installation repeatedly fails, the problem may involve storage or hardware rather than macOS alone.