A:Answer Hi,
Sad to hear that you forgot your pattern and I know how hard it is to that you can't use the phone. The only thing we can do is to reset the device through Boot Menu. Once you successfully reset your device, you will be asked to sign in your previous Google account you signed into the phone to continue using it. Check this link to know how to externally reset the device: https://mobilesupport.lenovo.com/us/en/Solution/MS120269
-Jess