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by m_t 2096 days ago
Yes, it can do that now.
2 comments

I buy quite a few of them as a tinkerer and recent (~two months) ones don't need firmware/BIOS fiddling to boot off USB. Make sure you get reasonably recent stock.
Is the documentation outdated? https://www.raspberrypi.org/documentation/hardware/raspberry... says “USB booting is still under development“ and https://www.raspberrypi.org/documentation/hardware/raspberry... says “The Pi 4B bootloader currently only supports booting from an SD card.”
Two minutes ago I plugged in a RPi 4 with no SD Card in it. It does have a USB stick plugged in.