Hello all
I received my Izettle blue reader today. I plugged the jack in my FP2 and launched the app --> It worked perfectly straight out of the box
I’m so happy because you scared me 
i was afraid i had to buy some adapter.
Maybe you have another problem ? Did you firmly plug it all the way in the jack ? Did you try with the cover removed ? When you plug the reader, do you see the dialog asking you to choose between card reader or headphone ?
Plus, I’m rooted and this didn’t cause any problem.