You will likely have to do a factory reset. We always advise having a backup of your device before doing a factory reset. Some device manufacturers do this a little differently, but for most of the Android devices we sell, the manufacturer will require that you turn the device off. Once it is off, press down the power button AND the volume up button (at the same time) for a few seconds. This puts the device in boot mode. Then, you can decide if you want to wipe the device and restart.