To ensure you’re in the safe mode, simply navigate to About This Mac > System Report > Software. Reboot into Safe Mode – To do so, restart the Mac and hold the Shift key while restarting.Before proceeding, make sure to backup all your important data or better perform a Time Machine backup. Regardless of the reason, it’s literally very easy to overcome this ‘error verifying firmware’ issue and normally proceed with the High Sierra installation on a compatible Mac. This error could arise if you’re using a third-party SSD on your Mac and in our case, it’s a Samsung Evo 250GB SSD. Don’t worry, you aren’t alone as several users including me encountered the exact same issue.
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