To answer my own question:
I did arrive by bus at the tarmac level of A, went through transit security (by accident).
Only there I did ask for the bus to T2, was pointed to the exact place I arrived 5 min before (outside security). After 2 min. a FZ minibus arrived took me and a few others to T2.

btw 2 lounges are available in T2 for $, but no alcohol is served anywhere