- How to update mac air boot rom from usb without another mac how to#
- How to update mac air boot rom from usb without another mac install#
- How to update mac air boot rom from usb without another mac upgrade#
- How to update mac air boot rom from usb without another mac software#
- How to update mac air boot rom from usb without another mac Pc#
Apple posted this in the now archived website About EFI and SMC firmware updates for Intel-based Mac computers. 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. Select the volume containing the bootable installer. Release the Option key when you see a dark screen showing your bootable volumes.
How to update mac air boot rom from usb without another mac Pc#
Basically, the same procedure occurs for firmware updates on my HP PC running Windows. Press and hold the Option (Alt) key immediately after turning on or restarting your Mac. 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.
How to update mac air boot rom from usb without another mac install#
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".
How to update mac air boot rom from usb without another mac how to#
If an error occurs while installing an update or upgrade, learn how to resolve installation issues.In short, the firmware cannot be updated either by upgrading macOS to High Sierra or by bless manually. If you downloaded any apps from the App Store, use the App Store to get updates for those apps.
How to update mac air boot rom from usb without another mac software#
When Software Update says that your Mac is up to date, then macOS and all of the apps it installs are up to date, including Safari, Messages, Mail, Music, Photos, FaceTime, and Calendar. Software Update shows only upgrades that are compatible with your Mac.
How to update mac air boot rom from usb without another mac upgrade#
If your System Preferences doesn't include Software Update, learn how to upgrade to macOS Monterey or upgrade to an older macOS, and use the Updates tab of the App Store app to get app updates.