If want to How to Remove Pattern Lock on OPPO A15 (CPH2185) in MRT Key then you can try to remove it by your self have to charge a battery with any charger and charged it by 90%. Your data is very important for so it is good to do a backup of data it may consist of contact details, important messages, emails or any other important thing which feel to be the backup in a device.

This backup can be done on another device. we have to do the backup because after a format of a device, all data will be gone and it will not be recovered. For backup in other devices, you can use another external device like hard drive, SD card or any other suitable devices. If are doing by own. do it at your own risk as we don't take any responsibility if a device is damaged

OPPO A15 (CPH2185) Unlock When Forgot Pattern Lock or Password in MRT Key you can easily solve with this method if you are fresher technician or experienced technician in android software related if the error occurs of USB not recognized then your USB is not working. if a battery is not charged, your USB socket will not proper work and you will fail in this method. if any issues please write your questions in the comment box I will try my best to help you.