Well. You are partially correct. I updated my PowerFlarm core to 6.0 and my Butterfly 57mm display to 3.4 without issue.
However, the database for Flarmnet is suspect. The Flarmnet version I downloaded this morning updated properly. The version showed on the display as normal upon bootup. My friend did exactly the same with his PowerFLARM with all the same updates as our gliders were side by side. However, while we could see each other, only our Hex numbers came across. Our competition numbers were gone. Are we missing something (such as an American file for data)?
Here is the link for Flarmnet database we used.
http://www.flarmnet.org/files/index.php