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I forget how the USB stick will appear on the Apple boot picker menu, but it will most likely be an orange icon and I believe it will be labeled as "Install macOS" or something similar. Now Option Boot the USB stick on the computer you want to install Mojave. Use the "BaseSystem.dmg" file as the source for Etcher. Then use Etcher to "burn" the "BaseSystem.dmg" file to the USB drive. Navigate the "Install macOS Data" folder to locate the "BaseSystem.dmg" file and copy it to your desktop.Ĭonnect your USB stick and erase it as GUID partition and MacOS Extended (Journaled) using Disk Utility. In the new Finder window you should be viewing the root of the drive and you should be able to see the folder containing the Mojave install data. To access the root of the drive, click the "Go" menu in the Finder and select "Go to Folder." and type "/" in the text field and click "Open". If the ~6GB portion of the Mojave installer gets stored on the root of the drive in a folder called something like "Install macOS Data" (I don't recall the exact name, but it should be easy to spot). Navigate to "Contents/SharedSupport" where you should find the "BaseSystem.dmg" file. If the full ~6GB Mojave installer gets downloaded to your "Applications" folder, then you can right-click on the "Install macOS Mojave" app within the Applications folder and select "Show package contents". This technique also works for High Sierra.

The hardest part is locating the "BaseSystem.dmg" file. If you boot this USB drive it will act like booting into Recovery Mode. My alternate method is to "burn" the "BaseSystem.dmg" file (contained in the ~6GB portion of the Mojave installer download) to a USB drive.

Tq 😊Įven with my alternate method you still must download the full Mojave installer since I extract a small file from the full ~6GB installer to use in my alternate method. Using the bootstable drive still need to install the mojave installer from apple store right? Hopefully you will share the step.