They added support for virtual reality headsets as well.īesides that, when it comes to Safari, Mac search engine, there are some notable improvements with the update. These formats compress data - that’s a benefit as files can get huge with ever-rising resolutions. Thus, it boosts performance and helps manage device memory issues.Īpple also introduced new formats for video and photos in this version. It enables the storage and encryption of a large number of files. The Apple file system is the most significant feature it brought. There are few bells and whistles, but the changes are noticeable and positive. High Sierra emphasizes the already-existing benefits of MacOS previous system, Sierra. Apple posted this in the now archived website About EFI and SMC firmware updates for Intel-based Mac computers.In essence, High Sierra took what was good with Sierra and developed it into a more comprehensive software. At some point, Apple decided to include firmware updates in the macOS installs.
You used to manually update the firmware. The APFS is new and older Macs would need a firmware update before being able to recognize this filesystem and read the boot files. Having to update the firmware to run High Sierra makes sense.
Basically, the same procedure occurs for firmware updates on my HP PC running Windows. The firmware is then instructed to update itself. When a SDD or HDD is formatted to use a GUID partition scheme by the Disk Utility or diskutil command, the EFI partition is automatically created.īasically, the firmware update is copied to the FAT32 formatted EFI partition. Apple posted that firmware updates require a GUID partition scheme at the archived website Firmware updates for Intel-based Macs require a GUID partition scheme, although the site does not explicitly say this must be the primary drive. I assume this EFI partition must be on the primary internal disk.
The EFI partition is used when the firmware is updated. Error while writing firmware updater for EFI.
It selected the ESP on internal hard drive as the staging EFI.
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.