“Failed to personalize the software update. Please try again.” means macOS stopped during the update or installation process, including its personalization stage. It can appear in Software Update or macOS Recovery while downloading, preparing, or installing macOS. Apple does not associate the wording with one confirmed root cause. The safest first action is to confirm that the Mac has internet access and sufficient available storage, then retry Software Update without letting the Mac sleep or closing its lid.
What “Failed to personalize the software update” means
The exact message can be accompanied by wording such as “An error occurred while preparing the update” or may end with “Please try again later.” A related download failure might ask you to check the internet connection. These variants can identify the same update or installation stage, but the wording alone does not prove that the Mac has a network, disk, account, or firmware fault.
Apple says errors in this message family can have different or temporary causes. Documented possibilities include an installer or network issue, insufficient storage, interference from other software, a damaged or unverifiable downloaded installer, or a persistent installation issue that may require firmware recovery on eligible hardware. Follow the sequence below from least invasive to most invasive, and stop as soon as the installation completes.
This guide is limited to the personalization message during a macOS update or installation. It does not cover unrelated recovery-server messages, separate insufficient-space errors, generic update failures, or firmware startup symbols.
Check storage and internet access, then retry Software Update
When this applies: Use this as the first-line fix before starting Recovery or attempting disk or firmware repair.
Prerequisites: You need administrator access to the Mac and a stable internet connection. Apple does not provide a universal free-space threshold for this exact message, so do not rely on an invented minimum.
- Free up storage if macOS reports that available space is low.
- Confirm that the Mac is connected to the internet.
- Retry the update in Software Update, following Apple’s Software Update instructions.
- If the installation is offered, allow it to finish without letting the Mac sleep or closing the lid.
Expected result: Software Update completes the download, preparation, and installation without displaying the personalization message again. If it succeeds, stop here.
Risk and rollback: Risk is low and the procedure is non-destructive. No rollback is needed. Backing up before installing macOS is still recommended.
Reduce software interference with Safe Mode or macOS Recovery
Retry from Safe Mode
When this applies: Use Safe Mode when you are installing through Software Update or the App Store rather than Recovery and want to reduce interference from other software.
Prerequisite: The Mac must be able to start in Safe Mode. Startup steps differ between Mac models, so use the appropriate Apple procedure rather than assuming one key sequence applies to every Mac.
- Start the Mac in Safe Mode.
- Open Software Update or the installer again.
- Retry the update or upgrade.
Expected result: The update proceeds while unnecessary software is prevented from interfering. Stop if installation completes.
Risk and rollback: Risk is low and the procedure does not erase data. Restart normally to leave Safe Mode.
Reinstall from macOS Recovery
When this applies: Use Recovery when Software Update continues to fail or when you need another way to reduce software interference.
Prerequisites: The Mac needs a working internet connection and must be able to start in macOS Recovery. Back up accessible data before reinstalling. Reinstalling from Recovery is not the same as erasing the Mac, but data preservation cannot be guaranteed under every abnormal disk condition.
- Start up in macOS Recovery.
- Choose the option to reinstall macOS.
- Follow the onscreen prompts to complete installation.
Apple documents the Recovery environment and reinstall option in Apple’s macOS Recovery guide.
Expected result: macOS reinstalls without the personalization failure. If the reinstall fails, return to Recovery and continue with startup-disk repair.
Risk and rollback: Risk is low and the confirmed reinstall path is non-erasing. If it fails, no special rollback is required; return to Recovery rather than proceeding directly to erasure.
Repair the startup disk with Disk Utility First Aid
When this applies: Use First Aid before deeper escalation when the startup disk may be contributing to the installation failure. The message itself does not confirm disk corruption.
Prerequisites: You need access to macOS Recovery and Disk Utility within Recovery.
- Open Disk Utility from macOS Recovery.
- Show all devices.
- Run First Aid on each volume.
- Run First Aid on each container.
- Run First Aid on the storage device itself.
Expected result: First Aid completes its checks and repairs any issues it can address. Afterward, retry the applicable installation path. Continue only if the personalization message remains.
Risk and rollback: Risk is low. First Aid is a repair check and has no rollback procedure. Do not add Terminal filesystem commands, repartition the disk, or erase it as part of this step.
Delete and redownload the installer only when Apple identifies it as damaged
When this applies: Use this fix only when a separately downloaded macOS installer exists and Apple reports that it is damaged or cannot be verified. It is not a general instruction to delete update files during an in-place Software Update flow.
Prerequisites: A downloaded installer must exist. Run startup-disk repair first when relevant.
- Delete the damaged installer.
- Repair the startup disk if needed.
- Download the installer again from Apple.
- Retry the installation.
Expected result: A new, verifiable installer completes the installation without reproducing the personalization error.
Risk and rollback: Risk is low and deleting the damaged installer does not erase personal data. If the replacement also fails, it can be downloaded again. Do not delete unspecified caches, system folders, or update databases.
Revive firmware on an Apple silicon or T2 Mac
When this applies: Consider firmware recovery only when the earlier steps fail and the affected computer is a Mac with Apple silicon or an Intel-based Mac with the Apple T2 Security Chip. Intel Macs without T2 must not use this branch.
Prerequisites: You need another Mac, a USB-C cable that supports both data and charging, and the ability to place the affected Mac in DFU mode. Model-specific DFU button sequences are not provided here because they vary and must be verified against Apple’s current procedure.
Revive before Restore: Revive is the preferred firmware action because it does not erase the affected Mac. Restore, covered in the next section, erases it.
- Connect the two Macs with the supported USB-C cable.
- Enter DFU mode on the affected Mac.
- On the other Mac, choose Revive.
- If the revived Mac starts normally, select the startup disk and continue.
Expected result: Firmware is revived without erasing the affected Mac, allowing it to start normally or continue the macOS installation.
Risk and rollback: Risk is medium because this is an advanced, hardware-specific procedure, although Revive itself is non-erasing. If Revive fails, proceed only if you accept the destructive Restore path or seek Apple service. Apple’s macOS installation error guidance places firmware recovery after the earlier installation and disk-repair options.
Restore the Mac only as the destructive final fallback
When this applies: Use Restore Mac only after Revive fails or Apple directs you to restore an eligible Apple silicon or T2 Mac. A firmware restore or disk erasure is a final fallback, not an early diagnostic.
Data-loss warning: Restore Mac erases the affected Mac and returns it to factory settings. Back up the Mac first if any data remains accessible. There is no rollback, and recovery afterward depends on an existing backup or reinstalling from scratch.
Prerequisites: You need another Mac, a USB-C cable that supports data and charging, DFU access, and a backup if accessible data must be preserved.
- With the affected Mac in DFU mode, choose Restore Mac on the other Mac.
- Confirm Restore and Update.
- If prompted, complete the restore and setup steps.
- For a T2 Mac, continue through Recovery and reinstall macOS if prompted.
Expected result: The affected Mac is returned to factory settings and can proceed through setup or macOS reinstallation. This outcome is not guaranteed if a hardware or service issue remains.
Risk and rollback: Risk is high. Restore is destructive and cannot be rolled back. Do not perform it before Recovery, First Aid, any applicable installer redownload, and non-erasing Revive.
What to verify if the personalization error still appears
If the exact message remains after every applicable non-destructive step, collect the following details before contacting Apple Support:
- The exact on-screen wording and whether it appeared in Software Update, a downloaded installer, or macOS Recovery.
- Whether the Mac has Apple silicon, Intel with the Apple T2 Security Chip, or Intel without T2.
- The current macOS version and the update or upgrade being installed.
- The available storage and whether macOS displayed a separate low-space warning.
- Whether Recovery produces the same personalization message.
- Which steps completed and whether First Aid reported or repaired an issue.
Do not infer a specific cause from community logs or the word personalize alone. Apple does not confirm Apple Account sign-out, disabling Find My, VPN or proxy changes, Terminal commands, installer edits, or update-state modifications as fixes for this exact message. Unresolved cases, Intel Macs without T2, and cases where firmware eligibility is uncertain should be escalated rather than exposed to unsupported or destructive workarounds.