![]() ![]() Hence, it reports "An error occurred while verifying firmware". As a result, the installer find out that your firmware is NOT a latest version still. It double checks the version of firmware to make sure it was updated successfully in previous process (namely point A). (marked as point A)Īfter the upgrade process (regardless success or fail), the installer continues. Then restart automatically and trigger the firmware upgrade process. ![]() The easy fix is to verify your backup and then erase the volume and run the installer against a blank / erased main storage drive.īecause the APFS requires support from a new version firmware, your mac's firmware will have to be updated to the latest version during the installation of High Sierra.Īfter the first restart, the installer prepares the latest version firmware which suitable for your mac model onto EFI system partition of your main disk with bless command. Apple has introduced a new file system APFS in High Sierra. ![]()
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