Hi, welcome to Android Forums, I'm sorry it's taken so long to get to your question.
Have you tried running your device in recovery mode. Without knowing your specific phone model, I cannot tell you exactly how to get there. Typically it's by turning off the device, press and hold the power button AND the volume up button at the same time until it boots up. This will get you into recovery mode. From there, run a factory reset. See if that helps. If that doesn't get you into recovery mode, please post your question again with your specific device information.