This is because the system wants to make sure the digital certification confirming the integrity of the program has not yet expired. When you require a copy of macOS and want to reinstall it through the Internet, Apple's servers use your system time to establish a secure connection. Some victims also reported that they received the UNTRUSTED_CERT_TITLE error message after they replaced a new startup disk on their MacBook Air or MacBook Pro. This error occurs most of the time when you are reinstalling macOS, especially macOS Sierra and High Sierra, on your Mac in Internet Recovery Mode. ![]() ![]() Why does your Mac report UNTRUSTED_CERT_TITLE? How to set the system date and time correctly? This article will explain what the error means and find practical solutions. It is not very common for Mac users to encounter UNTRUSTED_CERT_TITLE error in macOS Recovery Mode. However, when you reinstall macOS, an error UNTRUSTED_CERT_TITLE occurs to prevent you to do so. MacOS can be reinstalled to fix some Mac issues such as Mac not booting up or Mac kernel panic.
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