Bandluxe/Bandridge C501 LTE usb dongle

Hi all,
while having the Bandluxe/Bandridge C501 LTE usb dongle in the official supported hardware list, I cannot get it working with my routerboard RB751G.

I can see it as usb interface (usb1), but it does not appear under LTE interfaces list.

Someone else having this issue? or some trick to get it working?

I contacted mikrotik support and sent supout files as they requested me more than 1 week ago, and I’m still waiting for reply…

bests,
stefano