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How do I install an old Mac update?
Here are the steps Apple describes:
- Start up your Mac pressing Shift-Option/Alt-Command-R.
- Once you see the macOS Utilities screen choose the Reinstall macOS option.
- Click Continue and follow the on-screen instructions.
- Select your startup disk and click Install.
- Your Mac will restart once the installation is complete.
How do I update my EFI on my imac?
To complete the firmware update process, please follow the instructions in the updater application (/Applications/Utilities/Mac Pro EFI Firmware Update. app). The updater will launch automatically when the Installer closes. You can confirm the version of the Boot ROM installed on your computer using System Profiler.
Why do I need to update My EFI on my Mac?
That leaves a security hole in the system, because although users might have the latest OS version installed, if the EFI firmware is an older version, it lacks the latest fixes of known firmware issues. Apple released EFI updates separately, but since 2015 the EFI update is bundled in the software update Apple has been pushing out to users.
What is the latest version of EFI boot ROM?
On this website the following downloads are available for my system: EFI Boot ROM version: MBP81.0047.2AB (2015-001) SMC version: 1.69f3 (SMC 1.5) The SMC version is the same as the one installed on my system, so no need to update anything.
Do you need to update the firmware on a Mac?
If the firmware version displayed in the hardware overview is older than that listed for your Mac, then download the firmware and apply the update. Or update the operating system to at least macOS 10.12.6 Sierra, because this will include all the necessary security updates and the correct firmware.
Where is the EFI partition on a MacBook Pro?
The EFI partition is used when the firmware is updated. I assume this EFI partition must be on the primary internal disk.