I have an X5 but I'm using the 250 remote mainly for the air mouse.
My tv is jvc Fire TV and the included bt400 remote controls tv just fine (volume, power,source).
The 250 can't learn the volume, source etc because it's a fire tv remote for the tv (Bluetooth not IR) but it will control the volume for the buzz box.
It gets wierd though when I watch something in 5.1 surround via an iptv app like Tivimate.
Then the 250 controls the tv volume but if its not 5. 1 surround it only control the buzz box volume.
Anybody have an idea why this happens.?