Press , type your Mac's administrator password (the characters will not show as you type), and hit Enter again. Press Y to confirm that you wish to erase the drive.
Poorly packed disk images frequently fail during high-level partition formatting.
A USB flash drive with at least of storage capacity.
: Download macOS High Sierra 10.13.6 Update (approx. 1.88 GB).
: It is one of the final macOS versions to fully support older 32-bit applications before Apple dropped support entirely in macOS Catalina.
Navigate to System Preferences > Software Update and install any remaining security patches or Safari updates.