Sound too low on bluetooth mode.

@syedalam81869 since everything works as it should, except the volume, I suggest you try a new battery. This of course is never easy since they (manufacturers) do not want us to fix things. With these headphones it’s fairly straight forward. Basically, you remove the earpads. After that, remove the four screws that hold the driver to the housing. The battery is behind the speaker nestled into the headset. I suggest you check this video (it’s dreadful but has a bit of valuable information on how to remove the drivers (speakers). Use this document Internal Photos 2316351 for the rest of it. The second picture shows you the battery etc.