CT10 Firmware

I was checking my battery status today and noticed that come of my CT10 sensors have firmware 2.0.0 and some have 2.1.0.  How do I get the 2.0.0's updated and what was the update between the two versions?  I was looking at a link from the G80 forum on how to update but the S70 watch wasn't listed and when I go to the Sensors on the menu, there is no software update option.