MRT oppo a15 failed to remove pattern and hang on black screen

[Y0ussef12]

i tryed to remove patern from oppo A15 and its says failed after that it hang on black screen wont be on or off only mtk driver i tryed all button to make it restart and failled any suggestion please i dont want to open back cover of the phone to remove battery

Disconnect Mobile...
re-input Mobile Battery...
then connect usb to computer....
Make Sure your Mobie have power...
>>> Searching Mobile Com Port...
Get Mobile Port: COM15
>>> Driver Identifying name:
MediaTek USB Port
Connect Mobile TimeOut

 

[Y0ussef12]

anyone can help its urgent