I just received a replacement unit. The old one refused to recognize the smart card after working fine for 5 months. I'm curious if I can tell whether I got a new unit or a refurb. The unit looks to be in excellent shape. It was loaded with L055, so I'm hoping it's factory fresh. They wouldn't downgrade a unit from the field from L188 to L055 as part of the refurb process, would they?