Low volume during call

Hi everyone, I have galaxy s5 g900h. The volume during call is extremely low and when plugged earphones.. I've almost every sugested way but didn't succeed.
Tried wiping cache memory
Tried downgrade to 5.0 lollipop since am using 6.0.1 mashmallow
Tried different suggested apps
Loudspeaker works fine...
Help me plz.. its boring using speakerphone everytime i call somebody..
Thank you!

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