It got a flashing LED light indicating the firmware was about to be updated. sudo bless -mount / -firmware /MBP91_00D7_B00.scap -verbose -recovery ![]() ![]() Thus, I've no idea why High Sierra installer failed to update the EFI firmware at the very first time.Īccording to the chapter 2.0 How Does a Mac Update Its EFI Firmware & How Do You Find Your EFI Version of The Apple of Your EFI, with the following command bless, the file MBP91_00D3_B0C_LOCKED.scap extracted from mac2015002efiupdate.dmg, which downloaded from, and the file MBP91_00D7_B00.scap extracted from Install macOS High Sierra.app, it executed successfully. usr/libexec/efiupdater finished with status: 0 Writing firmware update installed cookie (/Volumes/MacSSD/macOS Install Data/.FirmwareUpdateInstalled) Volumes/bless.YdD7/EFI/APPLE/FIRMWARE/MBP91_00D7_B00.scap created successfully If look into previous log of EFI updating, it seems they are quite normal. Operation: Verify firmware failed, Failure Reason: Error Domain= Code=512 Key info in ia.log is as following.Ĭlearing automation and attempting to rebless.įailed to get disk for UUID specified for rebless. Here comes the detail.Īttempt 1 - update it by updating macOS from 10.12.6 to 10.13.2įailed with error message "An error occurred while verifying firmware". ![]() In short, the firmware cannot be updated either by upgrading macOS to High Sierra or by bless manually.
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