@tab97 android 4.1.1
Turn off your tab, press power and volume up button simultaneously, this will lead you to recovery. then do a factory reset.
please remember that doing so may erase all your downloaded and installed applications, contacts, messages, etc.
if the tab came with a software that can be installed on the computer, install it then, and follow the instruction on how to do an emergency recovery (reinstallation of firmware).
if the above first advised doesn't work for you, try pressing both power and volume up buttons, then pressing down and up volume buttons, respectively.
goodluck.
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