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Shut down the computer while leaving the USB stick plugged in.

Plug in the other Tails USB stick that you want to install from.

[[!img install/inc/screenshots/mac_option_key.png link="no" alt="'Option' or 'alt' key in the bottom left of Mac keyboard"]]

Choose the USB stick and press <span class="keycap">Enter</span>. The USB stick appears as an external hard disk and might be labeled <span class="guilabel">EFI Boot</span> or <span class="guilabel">Windows</span> like in the following screenshot:

[[!img install/inc/screenshots/mac_startup_usb.png link="no" alt="Screen with the logo of an internal hard disk labeled 'Macintosh HD' and an external hard disk labelled 'Windows' (selected)"]]

If the USB stick does not appear in the list of startup disks:

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If your computer still does not display the Boot Loader, it might currently be impossible to start Tails on your computer.

If your Mac displays the following error:

Security settings do not allow this Mac to use an external startup disk.

Then you have to change the settings of the <em>Startup Security Utility</em> of your Mac to authorize starting from Tails.

To open <em>Startup Security Utility</em>:

When you are asked to authenticate, click <strong>Enter macOS Password</strong>, then choose an administrator account and enter its password.

[[!img install/inc/screenshots/startup-security-utility.png link="no" alt="Startup Security Utility"]]

In the <em>Startup Security Utility</em>:

Choose <strong>No Security</strong> in the <strong>Secure Boot</strong> section.

Choose <strong>Allow booting from external media</strong> in the <strong>External Boot</strong>.

To still protect your Mac from starting on untrusted external media, you can set a firmware password, available on macOS Mountain Lion or later. A firmware password prevents users who do not have the password from starting up from any media other than the designated startup disk.

<strong>If you forget your firmware password you will require an in-person service appointment with an Apple Store or Apple Authorized Service Provider.</strong>