please Check : finder.flyme.cn maybe help you

I did the same thing and i just unlocked my phone [Thank god]

You may follow my way but I cannot promise it will also work for your (at least work for me)

Tool require:

1. a pc / laptop
2. download "Blustack"

Follow below step:

1) use your laptop download bluestack
2) login you goole account
3) download Phone Finder at Google Store
4) open Phone Finder and login
5) click the top right there, you can see unlock my phone
6) click unlock
7) restart your phone (press 7 sec)

Done~~

Hope it can help your~

I do not have this problem but I have benefited greatly from you