My phone won't ring and I can't hear sound on videos etc etc. China phone

Hi. I just bought a UMI touch phone. The phone won't ring and I can't hear the sound on videos etc. I have turned the sound setting to outdoor , but that did not help. After rebooting couple of times i reset the phone to factory, but that did not cure the problem. Can someone please help. The phone is running Android 6 and is Rooted.

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