After the firmware upgrade, High Sierra installer will open again, you can close it.Open the High Sierra 10.13.6 Mac App Store full installer, do the firmware upgrade as asked. Note, if you never used Mac App Store before, you need to validate your account first and download a free app before trying to get High Sierra This is the Apple Support page where you can get the link for the 10.13.6 Mac App Store Installer (you need this even if you already are on 10.13.6).You need the current High Sierra 10.13.6 full installer from the Mac App Store, no previous version have the needed 00 BootROM.
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