Booting A Raspberry Pi From USB

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A Raspberry Pi can be booted from a USB drive. This is helpful if you have a really fast USB SSD drive.

Ensure your bootloader firmware is dated Sep 3 2020 or later.

pi@raspberrypi:~ $ vcgencmd bootloader_version
Sep  3 2020 13:11:43

Ensure your OS version is 2020-08-20 or later.

pi@raspberrypi:~ $ cat /etc/rpi-issue 
Raspberry Pi reference 2020-08-20

If that all checks out, image a hard drive just like how you would an SD card. For example, Balena Etcher can image a USB hard drive instead of an SD card. After it is imaged, connect the drive to a USB3 port and power on the Pi.