2

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?

3

Do MacBook devices have something [firmware] similar?

Yes. It's call the EFI or Extensible Firmware Interface

Is it possible to reinstall MacBook firmware?

Yes. See this post: Where is the EFI stored on the macbook and is it possible to restore a previous EFI firmware version?

Is the firmware automatically reinstalled upon an OS reinstallation?

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:

Most firmware updates are automatically installed when you update or upgrade OS X. Some firmware updates are also available as downloads you can install manually. If your Mac needs a firmware update and it isn't installed automatically, check to see if a manual updater is listed below.

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:

If you don't see a firmware version listed in this article, it means that either a firmware update is only available as an automatic update, or no firmware update is needed.

  • The response about reinstalling MacBook firmware could be inaccurate because Apple no longer ships firmware CDs. The answer in reference was from 2013. There is evidence that Apple changed how this works after in models that shipped after 2013. – Max Savin Jul 17 '17 at 13:43
  • DVD or USB flash is the same thing - it's just DVD has fallen out of favor. However, you can create a DVD based install which would include whatever firmware updates that would be required: apple.stackexchange.com/questions/235243/… – Allan Jul 17 '17 at 16:19
  • Firmware updates are not the same as reinstallation.. – Max Savin Jul 18 '17 at 13:21
  • Oy vey... Please explain how you interpret the very last sentence of my answer. – Allan Jul 18 '17 at 14:14
  • Ah, previous Mac's shipped with an OS installation and a Firmware installation disk. Apple now does OS installation over the internet or USB, but they kind of killed the firmware part. I called Apple support about this and their top person did not know how it works on new models... I am waiting/hoping to hear back from their engineers now. – Max Savin Jul 18 '17 at 20:02

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