I have new compactlogix plc L43, it was 1.4 firmware rev and when i try to upgrade the firmware the communication lost during upgrade , I make this upgrade using Serial communication (very slowwwwww) Now i cannot see the plc on RSlinix and cannot communicate with it I know that if the communication loss during firmeare upgrade, the PLC will be stop and it should return back to allen bradley any one have soloution for this problem ??????????????