: A reliable flash drive (USB 2.0 was often more stable for installers than USB 3.0).
Before building your UniBeast 5.2.0 USB, double-check that you have a genuine Install macOS High Sierra.app . Apple no longer serves it via the App Store, but if you’ve previously downloaded it, it may be in your Purchased tab. Alternatively, use the softwareupdate --fetch-full-installer command in Terminal (macOS 10.14+). unibeast 5.2.0