Moving from BBBlack to PocketBeagle

I’ve got Debian and GCC code on BBBLack. I need more speed and less hardware so I’m trying to more to PocketB.
I copied eeverything: Debian, code etc to an SD card by running sudo ./opt/scripts/tools/eMMC/beaglebone-black-make-microSD-flasher-from-eMMc.sh The LEDs flashed in sequece in the usual way.

I then put the SD card in to the PB and plugged in the USB. The PB’s LED’s flashed for a while.
I expected to be able to log on via USB as before, but no…
Any ideas about what went wrong? Should I install the special Debian for the Pocket Beagle?

Try a stabile power supply while flashing.