N: Start up from a NetBoot server, if your Mac supports network startup volumes.Or use Option-Dto start up from this utility over the Internet. D: Start up from the built-in Apple Hardware Test or Apple Diagnostics utility, depending on your Mac model.If your Mac is using a firmware password, it ignores this key combination or starts up from macOS Recovery. Option-Command-P-R:Reset NVRAM or PRAM. If your Mac is using a firmware password, you're prompted to enter the password.
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