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I use latest V3.01_20170408 firmware which is Android 6.0 and have never tried different version of ROM. Yeah, it seems to be a hardware problem. I suppose it can be noise from back-light's supply or interference with speaker. I have read that some smartphone models had such problems before. I am interested if it's common problem of this device or just of some seldom instances. I it's a common problem of this phone than I will not care at all. But even not than I think it's not worth to get upset a lot about it because other phones has much bigger problems. |
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