I have got twi RS2 devices. One missed the firmware in the beginning. Thus it is working with 2.18.4.
The other one got the update and works with 2.20.4
I have done some testing at an known measurement point. Using one device as base the other as rover. During the work I wanted to check accuracy but using the newer firmware, the accuracy values are always 0.0 regardless any correction service. I used bluetooth for NMEA data export. NMEA data is also missing any information about accuracy.
I am quite sure, this is not the way it is supposed to be…
Any idea wether I could check any settings? Or is this a kind of bug of the firmware?