A Software Update Is Required to Use This Startup Disk: Complete Fix Guide for Mac
Encountering a software update is required to use this startup disk on your Mac is one of the more jarring errors Apple users face — it can appear suddenly during a clean install, when booting from an external USB, or even during a routine macOS upgrade. macOS Recovery Mode, Startup Security Utility, T2 chip security settings, NVRAM resets, Disk Utility First Aid, Safe Mode, and DFU firmware restore are all relevant to resolving this issue, depending on your specific Mac model and the exact context in which the error appeared. This comprehensive guide explains exactly why this error occurs, which Mac models are affected, and walks you through every verified fix from the simplest restart to the most advanced firmware recovery process.
What the Error Actually Means
During startup, your Mac verifies the integrity of the operating system on your startup disk to make sure that it is legitimate — if the OS is unknown or cannot be verified as legitimate, your Mac connects to Apple to download updated integrity information it needs to verify the OS, and this information is unique to your Mac, ensuring it starts up from an OS that is trusted by Apple.
When that verification process fails or cannot be completed, the prompt a software update is required to use this startup disk appears on screen. At this point you are presented with two buttons: Update and Startup Disk. Clicking Update launches the macOS installer to reinstall or update macOS on the startup disk. Clicking Startup Disk lets you choose a different disk, which your Mac will also attempt to verify against Apple’s trust records.
The error message means you need to update macOS before booting from your startup disk — you would typically get this message if your current macOS version is either outdated or incompatible with some security features or system functionalities.
Why This Error Occurs — The Root Causes
Understanding why a software update is required to use this startup disk appears is essential for choosing the right fix. The causes vary by Mac model and situation, but they fall into several distinct categories.
Outdated macOS version
The most straightforward cause is running a version of macOS that is too old for the Mac’s current security policy. Apple regularly updates the integrity certificates that macOS uses to verify startup disks. If your version of macOS is no longer in Apple’s trusted registry or its certificate has expired, the verification fails and the error appears.
T2 chip security settings conflict
The error message sometimes appears when you try to boot your Mac from an external disk or USB stick — the issue is usually caused by either an unstable internet connection or a problem with the way the external device is connected to your Mac, with T2 chip security settings being a particularly common culprit.
The error mostly happens with T2 Macs — the security settings in Startup Security Utility may need to be changed to Medium Security with the option to allow booting from external or removable media enabled before the boot from a USB installer will succeed.
USB hub or dock connection
There are two causes that seem to be more common than others: you are trying to boot your Mac from a USB stick that is connected to a hub or dock, and there is an issue with the Mac’s firmware or settings in Startup Security Utility. Connecting the USB device through a hub that also handles ethernet or HDMI introduces signal interference that can cause the authentication process to fail.
M1 Mac version mismatch
If you are experiencing this error on an M1 Mac when booting from an earlier macOS, for example if your Mac was updated to macOS 11.3.1 and you are trying to boot from a macOS 11 USB installer, you should change Full Security to Reduced Security because an M1 Mac is only allowed to boot from the same or later macOS version in Full Security mode.
Incomplete or failed macOS updates
Sometimes an update might not complete correctly — if an interrupted installation process occurred due to power loss or a sudden shutdown, this can contribute to the error appearing on subsequent boot attempts.
Internet connection failure during verification
On M-series Macs, one of the options in the security settings is to only allow authorized versions of macOS — the computer needs to verify with Apple that the startup disk has an authorized version of macOS installed, and this verification normally occurs in the background, but is triggered visibly if Wi-Fi is off or the Mac has been powered off for an extended period. why do companies use online collaborative productivity software
Mac Models and How They Are Affected
| Mac Type | Common Trigger | Relevant Security Feature | Primary Fix Path |
|---|---|---|---|
| Intel Mac (pre-2018) | Outdated macOS | Standard boot verification | Software Update / Recovery reinstall |
| Intel Mac with T2 chip (2018–2020) | USB hub, security settings | Secure Boot, T2 chip | Startup Security Utility, firmware revive |
| Apple Silicon M1/M2/M3 | Version mismatch, verification failure | Full Security policy | Reduced Security mode, Recovery reinstall |
| Any Mac | Failed update, incomplete install | Boot verification | Safe Mode update, Disk Utility First Aid |
Fix 1 — The Simple Restart
When a software update is required to use this startup disk appears for the first time, a simple restart is always the first step before attempting anything more involved.
As with all Mac issues, the first solution is always to restart the device — this is typically effective, saving time and effort, and is the simplest fix available before escalating to more complex solutions.
To restart your Mac cleanly:
- Navigate to the Apple menu in the top-left corner of the screen
- Select Restart from the dropdown menu
- Allow the Mac to complete the full restart cycle
After restarting, check whether the error persists. If it does not, ensure your internet connection is stable and allow macOS to complete any background verification with Apple’s servers before your next reboot.
Fix 2 — Connect USB Directly and Check Your Internet Connection
If a software update is required to use this startup disk appeared while attempting to boot from an external USB drive or installer:
If the USB stick you are trying to boot from is connected to a hub, try connecting it directly to your Mac — if you are using an adaptor to connect the USB stick because the USB stick has a USB-A connector and your Mac only has USB-C slots, consider cloning the USB stick to a USB-C stick and try booting from that.
To verify your internet connection during the boot process:
- When the startup disk selection screen appears, move the pointer to the top of the screen to reveal the menu bar
- Click the Wi-Fi icon and select your network
- Enter your Wi-Fi password if prompted
- Attempt to proceed with the installation or boot process again
A stable internet connection is critical because the Mac must reach Apple’s verification servers to authenticate the startup disk. If your connection is unstable, the verification fails and the error appears regardless of whether your macOS version is technically current.
Fix 3 — Boot into Safe Mode and Run Software Update
Safe Mode is a powerful diagnostic tool that strips macOS down to its essential components, preventing third-party login items, extensions, and background processes from loading. This environment often allows macOS updates to complete successfully when they fail in normal boot.
On Intel Macs:
- Shut down your Mac completely
- Press the power button, then immediately hold the Shift key
- Release the Shift key when the login window appears
- Log in — you may be asked to log in twice
- Open System Settings (or System Preferences on older macOS) and navigate to Software Update
- Install any available update
On Apple Silicon Macs (M1, M2, M3):
- Shut down your Mac
- Press and hold the power button until you see Loading startup options
- Select a volume, then press and hold the Shift key and click Continue in Safe Mode
- You will see Safe Boot in the menu bar confirming you are in Safe Mode
- Run Software Update from System Settings
Safe Mode only loads the essential files and apps your Mac needs to run, thus preventing any login items, extensions, apps, or processes that may cause the update failure from running.
Fix 4 — Run First Aid in Disk Utility
If the error is caused by file system corruption on the startup disk, Disk Utility’s First Aid function can identify and repair the underlying issue that is preventing the verification process from completing successfully.
By detecting and fixing file system errors on the startup disk, First Aid can assist if your Mac is not booting properly due to these issues — it establishes a stable environment in which the update process can be completed.
Steps to run First Aid:
- Open Finder and navigate to Applications, then Utilities
- Launch Disk Utility
- In the left sidebar, select the startup disk (typically Macintosh HD)
- Click the First Aid button in the toolbar
- Click Run when the confirmation popup appears
- Wait for the process to complete without interrupting it
- Restart your Mac and check whether the error is resolved
For Macs where the startup disk cannot be mounted in normal mode, boot into macOS Recovery (Command + R on Intel, or power button hold on Apple Silicon), open Disk Utility from the macOS Utilities menu, and run First Aid from there instead.
Fix 5 — Adjust Startup Security Utility Settings
This fix is specifically for T2 chip Macs and Apple Silicon Macs experiencing a software update is required to use this startup disk when attempting to boot from an external USB installer or an older version of macOS.
Shut down your Mac, press the power button while holding Command-R to boot into recovery mode, release Command-R when you see the Apple logo, choose an admin user, click Next and type in the user password, then when you see the macOS Utilities menu, click Utilities in the toolbar and choose Startup Security Utility.
Inside Startup Security Utility:
- Ensure that Allow booting from external or removable media is selected
- If Secure Boot is set to Full Security and you are certain the version of macOS you are trying to boot from is legitimate and safe, change it to Medium Security
- Click OK and restart your Mac
For M1 Macs, changing Full Security to Reduced Security allows booting from the same or earlier macOS version from a USB installer — once you have lowered the security, you can retry booting from the USB installer in Startup Manager to reinstall the operating system, and it is advisable to re-enable full security after the installation is complete.
Important: If it works, make sure the next time you boot from your regular startup disk, you go back to recovery mode, open Startup Security Utility, and change Secure Boot back to Full Security to restore the Mac’s optimal security posture.
Fix 6 — Reset NVRAM or PRAM (Intel Macs Only)
NVRAM (Non-Volatile Random-Access Memory) and PRAM (Parameter RAM) store certain Mac system settings including startup disk preferences, display resolution, and volume settings. Corrupted NVRAM data can cause boot errors including a software update is required to use this startup disk by pointing the Mac toward an invalid or outdated startup configuration.
NVRAM or PRAM resets help with software update errors by removing potentially corrupt startup disk settings, making the Mac rethink its boot options, and making sure the operating system can load correctly.
To reset NVRAM on an Intel Mac:
- Shut down your Mac completely
- Press the power button, then immediately hold Option + Command + P + R simultaneously
- Keep holding the keys for approximately 20 seconds
- Release the keys and allow the Mac to boot normally
- After restarting, go to System Settings and verify your startup disk is still correctly selected
Please note that Apple Silicon Macs do not use PRAM or NVRAM reset keys, so the steps above apply only to Intel models.
Fix 7 — Reinstall macOS from Recovery Mode
When simpler fixes have not resolved a software update is required to use this startup disk, reinstalling macOS from Recovery Mode is the next logical step. This process overwrites the system files that are failing verification without erasing your personal data and applications.
Recovery Mode key combinations for Intel Macs:
| Key Combination | What It Does |
|---|---|
| Command + R | Reinstalls the most recently installed macOS version |
| Option + Command + R | Installs the latest macOS compatible with your Mac |
| Shift + Option + Command + R | Reinstalls the macOS that came with your Mac |
For Apple Silicon Macs:
- Shut down your Mac
- Press and hold the power button until Loading startup options appears
- Click Options, then click Continue
- Select Reinstall macOS from the Recovery utilities menu
- Follow the on-screen prompts
Make sure your Mac has a working and stable internet connection because the installer needs the internet to get firmware and other information — this is particularly important for Apple Silicon Macs where the recovery process is deeply integrated with Apple’s verification infrastructure.
After reinstalling, macOS should boot normally and the error should be resolved. Run Software Update immediately afterward to ensure all security patches and firmware updates are current.
Fix 8 — DFU Firmware Restore (Last Resort for T2 Macs)
The Device Firmware Update (DFU) restore is the most invasive fix and should only be attempted after all other methods have failed. It resets the T2 security chip, system firmware, and internal SSD completely. This process requires a second Mac running a recent version of macOS and Apple Configurator installed.
A revive updates the firmware on the Apple T2 Security Chip and is designed not to make any changes to the startup volume, the user’s data volume, or other volumes, meaning user data may be retained if recoverable — while a restore updates the firmware and erases recoveryOS and macOS on internal storage, making data on internal volumes unrecoverable.
Attempt a Revive first before a Restore:
- A DFU Revive is appropriate when you can still see some boot activity and want to recover existing data
- A DFU Restore is necessary when the Mac is completely unresponsive and data recovery is no longer a priority
You will need a USB-C to USB-C cable that can carry data and charge your MacBook — do not use a Thunderbolt cable — and connect one end of the USB-C cable to the DFU port on the Mac, which is the rightmost USB-C port when you are facing the left side of your T2 MacBook, ensuring nothing is plugged into the other USB port except for a charging cable.
After a successful DFU restore, you will need to reinstall macOS through Internet Recovery Mode before the Mac becomes usable again.
Preventing the Error in the Future
Once you have resolved a software update is required to use this startup disk, a few preventive practices will significantly reduce the likelihood of it recurring.
Keep macOS current
Apple regularly updates macOS to introduce new features and security improvements, and failing to keep it current can prevent you from using newer startup disks or trigger security verification failures during boot. Enable automatic updates in System Settings under General → Software Update, or set a recurring reminder to check manually each month.
Maintain a stable internet connection during macOS updates
Many instances of this error trace back to interrupted updates caused by Wi-Fi instability. When performing major macOS upgrades, connect to a reliable network and consider using an ethernet adapter for a wired connection.
Back up before major updates
Always create a full Time Machine backup before performing a clean install or major macOS upgrade. If a software update is required to use this startup disk triggers a boot loop, having a recent backup prevents data loss and gives you a reliable restore point.
Avoid booting through USB hubs during installation
Connect USB bootable installers directly to your Mac’s built-in USB-C or USB-A ports. Hubs and docks — particularly those that handle multiple functions like ethernet and HDMI simultaneously — introduce connection instability that triggers the verification error.
Re-enable Full Security after installation
If you temporarily lowered Startup Security Utility to Medium Security or Reduced Security to complete a clean install, return to Full Security mode once macOS is successfully installed. This maintains the T2 chip’s optimal protection posture.
Frequently Asked Questions
Will this error erase my data?
The error itself does not erase data. However, some of the fixes — particularly a DFU firmware restore — will erase data if you choose a Restore rather than a Revive. Reinstalling macOS from Recovery Mode without first erasing the disk in Disk Utility preserves your personal files and applications. Always back up before proceeding with any advanced fix.
Which Mac models are most affected by this error?
T2 Macs often experience this error — issues with the security settings frequently lead to this problem, and it is also common while clean installing the latest macOS versions like Ventura and Monterey. Apple Silicon Macs (M1, M2, M3) can encounter the error when security policy settings conflict with the macOS version on the bootable installer being used.
What do I do if clicking Update just causes a boot loop?
A boot loop after clicking Update in the error prompt is a known issue, particularly on T2 chip Macs with pre-existing firmware or disk problems. If the Mac goes straight into Internet Recovery and a software update is required to use this startup disk appears again after completing the update and restarting, a DFU firmware restore to fully wipe the disk and recoveryOS and then completely reinstall has been confirmed as the resolution that clears the error blocking previous attempts.
Can this error appear on an Intel Mac without a T2 chip?
This error has rarely been seen on Intel Macs without a T2 security chip — on those systems, the standard troubleshooting approach is to check System Settings for available macOS updates and to run Disk Utility First Aid, and if no updates are available and First Aid finds no issues, an internet recovery reinstall is the recommended next step.
Does resetting NVRAM help on Apple Silicon Macs?
No. NVRAM and PRAM resets using keyboard combinations are not applicable to Apple Silicon Macs. For M1, M2, and M3 Macs experiencing a software update is required to use this startup disk, the relevant fixes are adjusting security settings through Startup Options, reinstalling macOS from Recovery Mode, or performing a DFU revive using Apple Configurator on a second Mac.
What if I have no administrator account to change security settings?
Trying to change any startup settings within Startup Security Utility within recoveryOS without any operating system will yield a No administrator was found error — this is because a SecureToken is needed to elevate the session and allow such settings to be changed, and that token cannot be provided when there is no operating system present, leaving DFU firmware restore as the only remaining option in that scenario.
How do I know if my Mac has a T2 chip?
Click the Apple menu, select About This Mac, then click System Report. Look for Apple T2 Security Chip in the iBridge section of the hardware overview. Alternatively, Intel-based MacBook Pros from 2018 to 2020, MacBook Air models from 2018 to 2020, Mac mini from 2018, iMac Pro, and Mac Pro from 2019 all include the T2 chip. All Apple Silicon Macs (M1 and later) use an equivalent integrated security architecture built directly into the SoC.
Summary of Fixes by Scenario
| Scenario | Recommended Fix |
|---|---|
| First occurrence, no USB involved | Restart and check internet connection |
| Booting from USB hub | Connect USB directly to Mac |
| T2 Mac, security settings conflict | Adjust Startup Security Utility |
| Intel Mac, possible disk corruption | NVRAM reset + First Aid |
| All Macs, failed update | Safe Mode Software Update |
| All Macs, persistent boot issue | Recovery Mode macOS reinstall |
| T2 Mac, complete boot failure | DFU firmware revive or restore |
A software update is required to use this startup disk is a frustrating but solvable error that almost always has a resolution within the fixes described above. Start with the simplest approach — restart and check your internet connection — and work progressively toward the more advanced options only if earlier fixes do not resolve the issue. The vast majority of users resolve a software update is required to use this startup disk through one of the first five fixes without needing to reach the DFU firmware restore level. Keep macOS current, back up regularly with Time Machine, and maintain Full Security in Startup Security Utility to minimize the chances of encountering this error again.