Raspberry pi 4 commision currently possible (MAAS 3.3)?

hurrah! well done!!!

How did you choose the USB Storage as Target during commissioning?

My setup is with separate CM4 motherboards in form of df-robot minitray’s

It was just there. 1. Flash rpiUEFI to the onBoard EMMC. 2. Insert USB-Storage to USB 2.0 Port and PXE boot. Then the USB Stick was there under “available drives” in the maas comissioning console. I did not figure out yet how to integrate other storage drivers such as usb3, nmve or sata. I guess it depends on the USB-controller chip. If it is the same as on the rpi4 it should work. Usb-Storage: Flash Voyager GTX