解決“Untrusted_Cert_Title”錯誤需先確保使用官方認證的安裝器并正確創(chuàng)建，其次檢查系統(tǒng)時間設(shè)置是否準確，接著更新固件和引導(dǎo)程序，最后嘗試通過網(wǎng)絡(luò)恢復(fù)安裝macOS。具體步驟為：1. 使用App Store官方安裝器并通過Apple工具如createinstallmedia創(chuàng)建USB安裝器，避免手動復(fù)制文件或使用第三方工具；2. 進入恢復(fù)模式后通過終端命令校正日期和時間；3. 檢查并更新Mac的EFI或固件，確認硬件支持目標macOS版本；4. 長按Option Command R啟動網(wǎng)絡(luò)恢復(fù)模式，從蘋果服務(wù)器下載驗證過的系統(tǒng)鏡像進行安裝。多數(shù)情況下此問題源于安裝介質(zhì)損壞或時間錯誤，優(yōu)先處理這兩項通?？山鉀Q問題。

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 date command 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Older Mac models sometimes have outdated firmware that doesn’t recognize newer certificates used by recent macOS versions.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.

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