![]() Post-installation, you can verify the macOS version from ‘About This Mac’ and check the new APFS file system in ‘ Disk Utility‘. During the process, the system will reboot several times. The installation should go seamlessly without any issues and the entire process should take around 45 to 50 minutes.Initiate the installation while you’re in safe boot mode – Go to the Applications folder and double-click on the “Install macOS High Sierra” app.To ensure you’re in 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.Apple has updated the chip’s firmware to fix the issue and says affected owners can contact Apple. ![]() Before proceeding, make sure to backup all your important data or better perform a Time Machine backup. Some Apple computers with the T2 security chip failed to boot after updating to macOS Monterey. 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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