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Table of Contents
1. Check whether the boot disk/recovery partition is complete
2. Check the disk format and partition structure
3. Clean up cache with NVRAM/PRAM
4. Try changing the network or turning off the firewall
Home Computer Tutorials System Installation macOS installation failed an error occurred while preparing the installation

macOS installation failed an error occurred while preparing the installation

Jul 11, 2025 am 12:37 AM
installation failed macos installation

When encountering the prompt "macOS installation failed: an error occurred while preparing the installation", it is usually caused by an abnormal boot disk, inconsistent disk format, cache problems, or network connection failure. 1. First check whether the startup disk is complete. It is recommended to use the official installation package and createinstallmedia tool to create it, or try network recovery mode; 2. Make sure that the target disk format is APFS (High Sierra and above) or Mac OS extension, and adopt the GUID partition table, and erase the disk reformat if necessary; 3. Clean up the NVRAM/PRAM settings, press and hold Option Command PR for about 20 seconds when powering on to reset the underlying parameters; 4. Change the network environment, use a wired connection, turn off the firewall or proxy, and view detailed logs at the terminal to assist in troubleshooting problems.

macOS installation failed an error occurred while preparing the installation

When encountering the prompt "macOS installation failed: an error occurred while preparing the installation", it usually means that the system encounters problems in the preparation phase while trying to install or upgrade macOS. This problem may be caused by a variety of reasons, such as mismatched disk format, hardware compatibility issues, network connection abnormalities, or temporary file corruption, etc.

macOS installation failed an error occurred while preparing the installation

Here are some common situations and solutions that can help you troubleshoot and resolve problems.

macOS installation failed an error occurred while preparing the installation

1. Check whether the boot disk/recovery partition is complete

If you are installing macOS through a USB boot disk, first make sure that the boot disk itself is fine. Sometimes the downloaded image is incomplete, or an error occurs during the production of the startup disk, which will cause the preparation to fail.

  • Make sure you are using the macOS installation package downloaded by the official channel (such as Apple's official website or App Store)
  • It is recommended to use the createinstallmedia command line tool when creating a startup disk.
  • If you are not sure if the boot disk is normal, you can try re-made

If you are installing from recovery mode (entering in Command R), it may be that the recovery partition is damaged. You can try Network Recovery (Option Command R) to reload the remote installation environment.

macOS installation failed an error occurred while preparing the installation

2. Check the disk format and partition structure

The target disk will be formatted before macOS is installed. Preparation can also fail if the disk format is incorrect (for example, not an APFS or Mac OS extension format), or if there is a problem with the partition table.

You can do this:

  • Enter "Utilities" -> "Disk Utility" in the installation interface
  • Check the format of the target disk:
    • If it is macOS High Sierra or above, it is recommended to use APFS
    • If it is an earlier version, you can choose Mac OS extension (log-style)
  • If the format is wrong, try to erase the disk and reformat it
  • Also make sure the disk partitioning scheme is GUID partition table (GPT)

?? Note: Ejaculate the disk and clear all data. Please back up important information in advance.


3. Clean up cache with NVRAM/PRAM

Sometimes some temporary cache or system settings remain can cause errors in the installation process. You can try cleaning up the NVRAM or PRAM settings.

  • Wait for a few seconds after shutting down
  • Press and hold the Option Command PR key immediately when powering on again
  • Lasts for about 20 seconds until you hear the second start-up sound (if any) or release when you see the Apple logo appear again

This step helps reset some underlying parameters and may fix some of the preparation phase issues.


4. Try changing the network or turning off the firewall

If you are installing from Option Command R, network connection is important. Sometimes, DNS resolution failure or network instability can lead to the failure to download the necessary installation components.

You can try:

  • Change the network environment (such as changing from company network to home network)
  • Use a wired connection instead of wireless
  • Temporarily turn off firewall or proxy settings

In addition, during the installation process, you can also open the terminal to view the log and enter log show --predicate 'subsystem == "com.apple.install.osinstallersetup" to obtain more detailed error information and help locate the problem.


Basically, these common investigation directions are all about these common investigations. Although the error seems a bit scary, it can be solved in most cases through the above method. The key is to be patient and check step by step and don’t rush to draw conclusions.

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