Default [q] locked out android tablet

My tablet had a pattern lock and my cousin kept attempting to open it and got so many attempts that it got locked . Then it required me to log on to my gmail account but it won't let me access saying ' INCORRECT USERNAME/PASSWORD ' but when I logged into the computer, I was in . I tried using ADB but USB Debugging wasn't on and I can't access the slide down menu . If I tried making a phone call [ MEDIAPAD ], go to settings, it redirects me to google sign in . I tried putting it on recovery mode but I get this fail message . Can anyone please help me ? This is a MediaPad S7-391wd model .