First, I'm not familiar with the ATS 909X, but if you're asking if the firmware can be reflashed, I think contacting Sangean directly would be the best approach.

Second, maybe the problems are caused by such things as poor connections or a cracked circuit board. Sometimes problems such as these are sensitive to twisting or otherwise stressing the case. A useful clue. If you haven't done these sorts or repairs, it's worth remembering that it's easier to make things worse than it is to make them better.