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iphone and bluetooth headphones won't change.

I have an iphone and a pair of bluetooth headphones, the headphones are great they have in built controls from what I understand apple have crippled the avrcp to only play and pause. They are really loud and I want to turn them down but the headphone controls don't work with iphone and the volume slider is restricted when paired with headphones. Can you help me?

Picture of iphone and bluetooth headphones won't change.