How to install a fresh copy of macOS from macOS Recovery (Internet Recovery)

An error occurred validating the installer data. The download is either damaged or incomplete.

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How to fix "Untrusted_Cert_Title"


How to create a bootable installer for macOS

If an installer says it can't be verified or was signed with a certificate that has expired

How to reset the System Management Controller (SMC) on your Mac

Reset NVRAM or PRAM on your Mac