At DME you follow the yellow TRANSIT signs upstairs when you approach the passport control area, then the transit route is a sharp left at he too of the escalator. Transit counters are straight ahead of you and can print BPs. Provided you have already checked in though, you can proceed immediate sharp left, through security and out into the departures area by gate 3. You need a paper boarding pass, not a mobile BP, as they need to stamp your BP with 2 stamps (one from the security lady and one from the immigration officer standing next to her).

It will take all of 3 minutes from getting off the plane to being landslide again.