FSBUS Stepper, Help

Hi Every bodyI have now build the stepper-board and the flash board, and I could flash the stepper board and read it again, but then:I connected it to the FSCOM first time and flash the CID, and then i connected it again to the FSCOM, and then all my lights in my cockpit light up, and i quickly disconnected the stepper board again.Now nothing is funktion in my cockpit, the FSKEY, FSDO, FSDISPLAY and the FSSERVO nothing is now working, but i can flash all the boards without no problem. I have the 5 volts from the FSCOM and all so the LED is working on the FSCOM.And it also not possibel to flash the new stepper-board any more, every time i get a "Divice missing" error.Can anybody help me out, I will be greatfull.Best regardsFinnDenmark