There was an update some time ago. I have an older unit (removable chip). The problem is that they (WikeMike) did not mark the chips with the version. So if one does upgrade, which they might do if we have enough units to send in at one time, you don't know if you upgraded or just had them rewrite the same firmware. Two of us are waiting to possibly do the upgrade. Also, it would be very nice to know what had changed from the old version to the newer version.
Bottom line is even D&L can't tell you for sure.