iOS devices have DFU mode, which enable one to completely reinstall the firmware and operating system.
Do MacBook devices have something similar? Is the firmware automatically reinstalled upon an OS reinstallation?
efifirmwaremacmacbook promacos
iOS devices have DFU mode, which enable one to completely reinstall the firmware and operating system.
Do MacBook devices have something similar? Is the firmware automatically reinstalled upon an OS reinstallation?
Best Answer
Yes. It's call the EFI or Extensible Firmware Interface
Yes. See this post: Where is the EFI stored on the macbook and is it possible to restore a previous EFI firmware version?
Not necessarily. The EFI is upgraded only if it needs to be upgraded. This can happen as part of a normal update process or it can happen as part of a macOS installation.
From Apple Support:
For the record - upgrade is defined as going from one version of macOS/OS X to the next one up.
It also goes on to state (which they highlight) the following: