Android Locked

[Ar Ey]

I changed the pattern of my device and it is working, but after the battery drained and turned on again, it no longer works? What do you think about this? Thank you. My device is Samsung Galaxy J7 Prime

 

[kate]

See if any of these help.

From Google, Can't unlock your Android device:
https://support.google.com/pixelphone/answer/3388218

Can't sign in to your Google Account:
https://support.google.com/accounts/troubleshooter/2402620

Reset your Google password:
https://www.google.com/accounts/recovery

Lost, stolen, or locked out post:
https://androidforums.com/android-lounge/691455-lost-stolen-locked-out-device-read-here.html