I'm not familiar with that specific tablet, but all Android devices have a way to enter a recovery mode menu that allow you to clear the cache or do a full factory reset. First, try the 'clear cache' option. If that doesn't work, you'll have to do a full factory reset (and you'll lose all of your apps and data).
- Turn off your tablet all the way.
- Then press and hold Volume Up + Power button until you see the Recovery Mode menu.
- From menu on your screen choose option "clear cache" or "delete cache" by using Volume buttons to scroll and Power button to confirm.
- Try to restart your tablet. If it still doesn't work, then do the same thing again, but this time...
- From menu on your screen choose option "wipe data/factory reset" by using Volume buttons to scroll and Power button to confirm.
- After that select option "Yes -- delete all user data", and confirm that.
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