Right now you just need the Dexcom receiver or the Dexcom phone ap to extend your G6 sensors. It’s just I guess the new G6 transmitters are possibly going to be the issue. But I haven’t gotten a new one yet so they have plenty of older ones around still…for now.
I’m using the 81xxxx series transmitters and have no problem extending them with the same method I used with the 80 series. There are several methods to extend the sensor and this may not be true for all of them.
Dexcom states the serial number change reflects manufacturing activities only and that the software wasn’t touched. But I take that with a grain of salt because it’s coming from TCS in Manila and I don’t think they are quite up to speed yet.