Eventually, I got a reply from Davis that reads:
From what I am seeing, you have the 6152. This is the USA version, as it has no letters after the model.
And it appears that you are in Poland. Poland, uses the European frequencies, not the USA frequencies. I am not sure how you would have had this working previously.
The 6152 is hard coded to the USA Frequencies, and the WLL selects the proper frequency based on the address you install with.
It looks like I purchased the US version of WLL and what do you think I should do now?
Will setting the console to retransmit in ID2 and get WLL to listen for ID2 be working?