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I read on another site that you can use macOS Internet Recovery to install macOS on a blank SSD? Where would the files be stored? On the firmware? If there any way that the firmware could be erased? (I.e. would running sudo rm -rf / on the disk also wipe the firmware or is it more complicated than that? Is there any way that the firmware could be erased?). I'm working on a disaster recovery plan incase I ran a stupid command like sudo rm -rf /.

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  • My biggest concern is whether it's possible to delete the firmware and therefore internet recovery. (assuming it's stored on the firmware) – user244412 Jul 21 '17 at 4:21
  • Have you tried using Command+R to start Internet Recovery when booting up the machine? – chungonion Jul 21 '17 at 4:44
  • I don't need to use it at the moment, I'm working on a disaster recovery plan. My main question is it possible for the 'root' user to delete macOS Firmware (not wipe the disk but the firmware itself) from terminal? – user244412 Jul 21 '17 at 4:47
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Long Version: The code which permits Internet Recovery Mode (i.e. a slightly modified TFTP client) is stored in the computer's firmware. (In fact, it is a part of it). It's similar to the BIOS chip on Windows computers. When you boot through Internet Recovery, it will download a recovery partition image and load it into the computer's RAM. After this process, you will be able to boot into the normal macOS Recovery interface.

Short Version: If you were to wipe/replace your hard drive, Internet Recovery would automatically download and load a recovery partition image into the RAM, so you would be safe (as long as you have a backup of your data).

PS. Also, it is impossible to wipe the laptop's firmware with a simple sudo rm -rf / command.

Source: Chat with Apple Support

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  • So just to confirm it's impossible to wipe the firmware even if I'm flat out stupid with my root account? – user244412 Jul 21 '17 at 5:42
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    This answer is in parts wrong! Internet Recovery Mode boots to a macOS netboot image hosted by Akamai (as of today) and doesn't install anything on your hdd/ssd! It's only loaded into RAM. The code to allow a net boot is indeed located in the firmware but is rather small (compared to the netboot image). – klanomath Jul 21 '17 at 11:55
  • @NathanielSuchy Yes. You can't wipe the firmware without opening your computer, – fluxoverflow9102 Jul 23 '17 at 8:53

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