Possible bug in combiantion with bluetooth headsets in B521 H60-L04

I have the L04 and i use the Deleycon Prestige bluetooth Headset.
Whe i hear music with the bluetooth headset and start the camera app, my headset shuts down.
The music player plays a little while, but without sound over the phone speaker, as i would expect it.
The proble is reproducable. It appear when i start the camera, or if camera app starts, when i exit the camera app with the back button.
I have to power up my bluetooth headset again to hearr music over my headset.

i request users with bluetooth headsets if they can reproduce it.

Honor 6 L04 B521 back to stock B370 4.4.2

Hello friends, i'd like to ask how to back from 5.1.1 Lollipop B521 L04 to B370 4.4.2. I wrote to Huawei Devs, but their answer was: We are sorry but we can't give you any informations about that.
I'm asking because after update my phone turns into unstable device.. Forced close apps, self-restarts, self hang up calls, freezes etc..
I'm asking for help, i'll be thankful for every answer or help..