Get all the firmware required from the Pi imager.
For years the Pi was stuck with running from its SD cards, but finally the Foundation has released a firmware update process that’ll enable you to boot a Pi 4 and Pi 400 from a USB device. The Pi Imager tool offers a Misc Utilities section with the required firmware. Get a full guide here: www.tomshardware. com/uk/how-to/boot-raspberry-pi-4-usb.