If your Mac is using a firmware password, you're prompted to enter the password. macOS Recovery installs different versions of macOS, depending on the key combination you use while starting up. Or use Option-Command-R or Shift-Option-Command-R to start up from macOS Recovery over the Internet. Command (⌘)-R: Start up from the built-in macOS Recovery system.Keep holding until the described behavior occurs. To use any of these key combinations, press and hold the keys immediately after pressing the power button to turn on your Mac, or after your Mac begins to restart. These options can be invoked by holding their respective key combinations immediately when powering on the system however, if you use Apple's Bluetooth keyboard, you could find that the system. Print these boot option keys, because they’re particularly helpful to have. You can also change what your Mac does by holding down the following keys or key combinations during startup.
When your Mac powers up, it normally uses the system on its internal hard drive unless you change this behavior by choosing System Disk. The WINDOWS key becomes the ALT / OPTION key on Mac OS and the ALT key becomes the COMMAND key on Mac OS. Click the dropdown next to COMMAND Key and select Option. Click the dropdown next to OPTION Key and select Command.
On the Select Keyboard dropdown choose K750. Under the Keyboard Tab look for the Modifier Keys. Likewise, the Windows / Microsoft button coincides with Command while there are no. But in the previous lines of this guide, I specified that the Option key coincides with Alt, so if you use a Windows keyboard just press the Alt button to signal the option to OSX. If for any reason you are using a PC keyboard with Mac OS X you may need to use some abbreviations that require the Option button.
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