Serial device not added correctly

[baltika_no_9]

Yes a difficult one indeed - which option introduces the fewest problems for users? If we were to identify based on all four of the attributes then those with serial numbers would always work. Those without would fall back to relying on the model and we would not be in a worse position than we are now I think? I don't think anyone would lose out but I have no idea on the effort involved in achieving that.