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Fixing the 'Untrusted_Cert_Title' error during macOS installation
Fixing the 'Untrusted_Cert_Title' error during macOS installation
Jul 07, 2025 am 01:06 AM
To resolve the "Untrusted_Cert_Title" error, you must first make sure to use the official certified installer and create it correctly. Secondly, check whether the system time settings are accurate, then update the firmware and bootstrap, and finally try to install macOS through the network recovery. The specific steps are: 1. Use the official App Store installer and create a USB installer through Apple tools such as createinstallmedia to avoid manually copying files or using third-party tools; 2. After entering recovery mode, correct the date and time through terminal commands; 3. Check and update the Mac's EFI or firmware to confirm that the hardware supports the target macOS version; 4. Long press Option Command R to start the network recovery mode, and download the verified system image from the Apple server for installation. In most cases, this problem stems from a damaged installation media or a wrong time, and prioritizing these two items usually solves the problem.
If you're trying to install macOS and run into the "Untrusted_Cert_Title" error, it usually means the system can't verify the installer's certificate. This issue commonly shows up during a clean install or when using a USB installer that isn't properly signed or configured.
Here's how to tackle it based on different scenarios:
1. Make Sure Your Installer is Official
Apple uses signed certificates for macOS installers. If you're booting from a USB drive or an external volume, the installer must be created correctly with Apple tools like createinstallmedia .
- Use the official macOS installer from the App Store
- Create your USB installer using Terminal commands provided by Apple
- Avoid third-party tools unless they're known to preserve certificate signatures
?? A common mistake is copying the installer files manually instead of using the proper method. That breaks the signature chain and leads to this error.
2. Check Date and Time Settings
The certificate verification process relies on accurate date and time. If your system clock is off — especially if it's far in the past or future — macOS won't trust any certificate, even valid ones.
To fix:
- Try booting into Recovery Mode (Command R) first
- Open Terminal and use the
datecommand to set the correct date/time - Reboot and try installing again
This often happens on older Macs with dead PRAM batteries or virtual machines with incorrect clocks.
3. Update Firmware and Bootloader
Older Mac models sometimes have outdated firmware that doesn't recognize newer certificates used by recent macOS versions.
- Check Apple's support site for EFI or firmware updates relevant to your Mac model
- Make sure your machine meets the minimum hardware requirements for the macOS version you're installing
Sometimes you'll need to upgrade to a supported macOS version first before upgrading further.
4. Try Installing Online (Internet Recovery)
If all else fails, use Internet Recovery. It downloads a verified copy of the OS directly from Apple servers, bypassing local certificate issues.
Hold Option Command R at startup to enter Internet Recovery Mode. It may take a while depending on your internet speed, but it's reliable.
This works best if you're not tied to a specific macOS version. Internet Recovery gives you the OS that came with your Mac — or the latest compatible one.
Most cases of "Untrusted_Cert_Title" are due to either corrupted install media or incorrect system time. Fix those two things first, then look into firmware and recovery options. It's not complicated, just easy to miss a step.
The above is the detailed content of Fixing the 'Untrusted_Cert_Title' error during macOS installation. For more information, please follow other related articles on the PHP Chinese website!
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Jul 07, 2025 am 01:06 AM
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