Hi again,
you're right. Despite the fact that I restored it to 244 and the station started working (I mean green light, red lattice of leds as usual) I get no tracking in A mode. Steam VR says that the station works well and is tracked but headset does not work with station's A mode at all. Tried to update firmaware to the newest suggested by Steam VR but get blinking red again. What should I do?