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Most of volume controls on my PRESTIGIO PMP5080CPRO android 4 tablet became disabled (all except alarm volume control). And there are no sound except alarms. What could happen? How can I enable them ? I haven't installed anything recently. Here are screenshots:

Screenshot Screenshot
Screenshots (click images for larger variants)

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  • @Poldie, 2nd screenshot narrows everything perfectly Dec 3, 2013 at 10:10
  • @HongKilDong except that it still doesn't tell us which device it is. I don't think everybody can tell that from some "Model number".
    – Izzy
    Dec 3, 2013 at 10:20
  • @Izzy, how can I describe device more than google can ? What information should I provide ? Dec 3, 2013 at 10:49
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    That's a model number; analogous to saying "I have a gt-i9300" when it would be a lot more meaningful to say "I have a Samsung Galaxy S3 (international model)". No-one else is going to Google that for you if you can't be bothered to.
    – user5506
    Dec 3, 2013 at 11:32
  • @HongKilDong Exactly as you did with your update (thanks) :) Additionally, for non-mainstream devices, a link is often helpful.
    – Izzy
    Dec 3, 2013 at 11:44

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