Oh!
It is called enable-beagle-flasher I think: Debian 11.x (Bullseye) - Monthly Snapshots .
Seth
P.S. Here: https://rcn-ee.com/rootfs/bb.org/testing/2022-09-02/bullseye-iot-armhf/am335x-debian-11.4-iot-armhf-2022-09-02-4gb.img.xz .