Tips: MTK6575 remove screenlock operation without usb debugging, w/o root, w/o userdata loss problem!

How to remove screenlock(Pattern, PIN, Password, Face lock):
1. Choose "Screen Lock" and then check "Android Usb Debug" option
2. Click "Start"
3. Disconnect usb cables and then power on the phone after software request power on the phone
4. Connect usb cables after phone power on
5. Unlock done

Keywords: MTK, MTK6575, Remove screenlock, Pattern lock,  w/o usb debug, w/o root, face lock, w/o userdata loss, Lenovo A750