· That's because Intel Macs do not support Open Firmware rather they use EFI. To select a boot partition at startup after the chime press and hold down the OPTION key until the boot manager screen appears. If you wish to access the Unix command line at startup you must press COMMAND-S after the chime and hold it until a black screen with white type appears. More Less. Jun 21, 2007 2:41 …
CHAPTER I - accessing open firmware and other fundamentals. There are three methods to access OF (assuming that it is configured to use keyboard and screen). You can press alt+alt+o+f when you hear the boot chime and the OF console comes up. You can press alt when you hear the boot chime and a boot manager comes up (New World only).
· For newer modern Macs and modern OS X versions, we’ve got you covered here by setting a firmware password: How to Set a Firmware Password on a Mac; A good walkthrough is on Apple’s knowledge base site for older Macs with PowerPC processes and older versions of OS X too: Apple: Setting up firmware password protection in Mac OS X
According to ADC documentation: You can access Open Firmware this by holding down Command-Option-O-F at boot time. However, in reality this does not work on current hardware. Does anybody know if there is a way (through trigger-keys, etc.) to get to an EFI console on contemporary-architecture (i.e., Intel) Macs?
On a PowerPC-based Macintosh, the Open Firmware interface can be accessed by pressing the keys ⌘ Cmd+⌥ Option+O+F at startup (⊞ Win+Alt+O+F if using standard PC USB keyboard). Intel-based Macintoshes do not use Open Firmware; they use Extensible Firmware Interface.
· If your Mac is using a firmware password, you're prompted to enter the password. Option (⌥) or Alt: Start up to Startup Manager, which allows you to choose other available startup disks or volumes. If your Mac is using a firmware password, you're prompted to enter the password. Option-Command-P-R: Reset NVRAM or PRAM.
· Enter a firmware password in the fields provided, then click Set Password. Remember this password. Quit the utility, then choose Apple menu > Restart. Your Mac asks for the firmware password only when attempting to start up from a storage device other than the one selected in Startup Disk preferences, or when starting up from macOS Recovery. Enter the firmware password …
This way, you should have temporary access to the bin folder to make any needed changes. Pro Tip: If you find yourself running short of storage on your Mac, clear out your downloads folder. Everything you’ve ever downloaded that you’ve not moved somewhere else or copied is sitting in that folder. Going right back to when you got your Mac ...
· Go to the Apple menu in the main menu bar and choose Software Update Firmware can normally be installed as part of the regular Software Update process 2. A small window opens whilst your Mac checks to see if any software updates are available.
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