Thank you, I will root the device tonight and report the result after following these steps.Here you have a solution for low call and mic install es file explorer enable root from option ant go system, etc. Mixer path open it scroll down near end now check handset digital value go editor and chage from 84 to 92 than change earpiece value from 6 to 8 save it and reboot phone now feel awesome in call sound
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Remember mixar path-mtp-xml
On a second thought, this method must be good for a device which already works for calls, but the sound is low or bad quality. I will still try that along with a few extra solutions which are only possible with root.
Edit: None of the many methods worked, so I finally solved the issue by flashing a different rom. Thank you for all your support anyway.
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