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what it means white hand sign?


AC Question

I have samsung galaxy tab 3 lite and I have problem. Tablet doesn't responding at all. I have white hand in left up corner. Touch doesn't responding at all, I can't swipe sreen or enter in any of app. I need to tap few time, just to select app which i wanna use. Also, main problem, I can't swipe down and see a list (for wi-fy, bluetooth, plane mood,....) or some news or message from contact from viber,fb,.... i tryed to restart and swith off device, but after that, I have same problem. i have antivirus, but device is not infected. (avg). What to do? i can't send pictures from tablet to my computer, because I can't turn on bluetooth or go in galery....help me pls.