Hi,
…needed some time to find my old post.
FP2 (Android5+) & HW is capable of utilizing BT 4.0 LE (which is rather based on a different software stack than different HW. Read here or here).
@RSpliet
I know it’s not easy to find this specific “LE” feature mentioned in datasheets or technical specs. Maybe because it was firstly implemented in BT4.0 and as I could understand not specifically formed in silicone but rather software based. Even there are different sources for datasheets from Qualcomm with more or less difference in detail level.
Hence I could recall that I had written some about it in the past where I had access to such details and FP2 tech specs were still broadly to be found.
Actually I know it’s working as I have a few accessories in use with my FP2/Android6 making proper use of the “LE” feature.
I assume it’s rather an improper (quick&dirty) software implementation (just as firstly concentrating on french speaking natives and not taking all citizens in France into account…).
You could give a feedback to the developers about this BT issue. Maybe they are interested in reaching as many users as possible with the app. 