Mac User Guide
- Welcome
- What’s new in macOS Sequoia
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- Get started with Apple Intelligence
- Use Writing Tools
- Use Apple Intelligence in Mail
- Use Apple Intelligence in Messages
- Use Apple Intelligence with Siri
- Get webpage summaries
- Summarize an audio recording
- Use Apple Intelligence in Photos
- Summarize notifications and reduce interruptions
- Apple Intelligence and privacy
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- Intro to Continuity
- Use AirDrop to send items to nearby devices
- Hand off tasks between devices
- Control your iPhone from your Mac
- Copy and paste between devices
- Stream video and audio with AirPlay
- Make and receive calls and text messages on your Mac
- Use your iPhone internet connection with your Mac
- Share your Wi-Fi password with another device
- Use iPhone as a webcam
- Insert sketches, photos, and scans from iPhone or iPad
- Unlock your Mac with Apple Watch
- Use your iPad as a second display
- Use one keyboard and mouse to control Mac and iPad
- Sync music, books, and more between devices
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- Control what you share
- Set up your Mac to be secure
- Allow apps to see the location of your Mac
- Use Private Browsing
- Keep your data safe
- Understand passwords
- Change weak or compromised passwords
- Keep your Apple Account secure
- Use Mail Privacy Protection
- Use Sign in with Apple for apps and websites
- Find a missing device
- Resources for your Mac
- Resources for your Apple devices
- Copyright
What is a firmware password on Mac?
A firmware password prevents users who don’t have the password from starting up from any internal or external storage device other than the startup disk you’ve selected. It also blocks the ability to use most startup key combinations.
To create a firmware password, start up your Mac from macOS Recovery by pressing and holding the Command and R keys immediately after turning on your Mac. When the Recovery window appears, choose Utilities > Firmware Password Utility (OS X Mountain Lion through macOS Sierra) or Utilities > Startup Security Utility (macOS High Sierra or later). These utilities are available only on Mac models that support use of a firmware password. To learn more, see the Apple Support article Set a firmware password on your Mac.