610m
There isn't a recall on the 610, however if you have one with a short antenna, the service center will update it for you. The current length antenna is standard length of 39" approx, so if it is much shorter than this without the blue dot, it is likely that it is the older version. All you would need to do is send it in with your name, address, phone number, and a desription of what needs to be done.