My understanding is that Air Lithuanica is planning to operate an Embraer 170 this summer. But the BM ER4 still shows up on certain flights in the GDS. Apparently work in progress.
The question is of course whether BM would have a frame available, assuming that the fleet currently stands indeed at 18 frames. I find it difficult to believe that they would schedule all 18 frames for daily operations across Europe, given that they also operate corporate shuttles for Airbus. I doubt that Airbus is accepting the risk of an AOG without a spare in BM's fleet.