Pi4 boot-from-usb-only now in beta

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This will require manually updating to the latest beta firmware with  
rpi-update and to the latest beta eeprom image. So probably wait a few  
weeks if you don't want to risk thrashing your Raspbian install (or  
possibly even the eeprom of your Pi?).

Announcement and discussion:
https://www.raspberrypi.org/forums/viewtopic.php?f63%&t27%4595

All the Pi4 boot info:
https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2711_bootloader_config.md

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