Any ideas why this would be, and why it's not letting me install macOS High Sierra 10.13?Īlthough the 2018 MacBook Pro originally shipped with macOS High Sierra 10.13, could it be that I have a later model of 2018 MacBook Pro, that only has drivers for macOS Mojave 10. I then restart the computer holding the Option key and booted using the USB installer.Īfter a loading screen, I keep getting a Install macOS Mojave menu. So I've gone for another solution: I've created a USB installer of macOS High Sierra 10.13, wiped the MacBook Pro drive again, gone to the Startup Security Utility, and set medium security and allowed boot from external drive. But for some reason when I do this it keeps loading macOS Mojave 10.14. I've tried reformatting the main drive using Disk Utility and then re-installing the OS from recovery mode, which from past experience loads the lowest OS the machine shipped with (for the 2018 MBP that is 10.13.6). This is an option available to those users who have the macOS Sierra version installed right now or directly have the installer on a USB already created. Then, it proposes to build a bootable install disk and make. I've got a 2018 MacBook Pro (Model ID : MacBook 15,1) that shipped with macOS Mojave 10.14, that I need to downgrade to run macOS High Sierra 10.13. As soon as you launch the application, it tries to find the OS X Install program with Spotlight.
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