What should I do?Īfter creating the USB drive to install High Sierra my laptop, a Lenovo Ideapad 300, will not boot to the installer, it just stops with a black screen and sits there. The only option at this point is hit the “ok” and reboot and then I got the same thing. I got a message that said “EFI USB Device has been blocked by the current security policy” I’ve tried step by step to install High Sierra on my Lenovo G50…
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