Download the macOS Mojave developer beta installer application from the Mac App Store.First, connect the USB flash drive to the Mac (if the USB flash drive is not yet formatted as MacOS Journaled Extended, do that first with Disk Utility).How to Make a Bootable macOS Mojave 10.14 Beta USB Installer Drive Be sure to backup the Mac before beginning this process. Patience and some technical knowledge, with experience using the command lineīuilding a USB install drive for macOS Mojave beta requires using the command line, where exact syntax must be used in order to avoid erroneously erasing the wrong volume.A Mac that is compatible with macOS Mojave.The macOS Mojave 10.14 beta installer application downloaded in full from the Mac App Store and residing in the /Applications/ folder ( direct link).A Mac with internet access, and the Mac App Store.A blank USB flash drive (16GB or larger is recommended), this will be erased to become the boot installer drive for macOS Mojave beta.Requirements to Make a macOS Mojave 10.14 Beta USB Install Driveīefore getting stated, you’ll need to meet a few simple requirements to be able to properly create a functioning macOS Mojave beta installer boot drive: Note the commands for creating a bootable installer are different for macOS Mojave public beta and macOS Mojave developer beta. The tutorial here will walk through how to make a bootable USB install drive for the macOS Mojave 10.14 beta. A bootable macOS Mojave installer has several benefits, including the ability to format a target disk, easily perform clean installs, the ability to install the beta on multiple Macs without having to re-download the installer, and of course since it’s bootable it can be used as a troubleshooting device for macOS Mojave beta Macs as well.

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