So after you upgrade to High Sierra, then you must swap the new Metal card in and run the Mojave installer. Mojave requires a metal card to install it.High Sierra installer, when it does the firmware update, will require your original video card because it needs the video card's boot screen.This is important because the High Sierra installer includes a firmware update that is needed also for Mojave. ![]() You will be stopped by the installer and told to upgrade to High Sierra first.
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