There is a section of the documentation labelled 'Updating the bootloader' at https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2711_bootloader_

There is a section of the documentation labelled 'Updating the bootloader' at https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2711_bootloader_config.md https://www.raspberrypi.org/documentation/hardware/raspberry...