How to Update the Boot Partition in a Mac (5 Steps)

Log in to your Mac computer with an account that has administrative privileges.
Click on the 'System Preferences' icon in the dock at the bottom of the desktop.
Navigate to the 'Startup Disk' control panel underneath the 'System' heading. The control panel will display a list of the boot partitions available on your primary hard drive.
Click on the name or icon of the boot partition you want to use.
Press the 'Restart' button and then click 'Restart' again to confirm your decision to update the boot partition settings. When the computer restarts, it will boot to the partition you just selected.
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