Answer 1

Hi. To clear a lost or forgotten screen lock password, a hard reset is necessary. Refer here http://satechhelp.co.za/4971/Common-Hard-Reset-Steps-Android-Powered-Devices or comment below with your device's model number as seen on the white sticker under the battery.

Comments

Hello

That defers from phone model to model.

•  Some phones requires a simple hard reset using a combinations of buttons to get into recovery mode where factory data reset can be performed.
• Some requires a master reset code
• Some requires flashing the phone's firmware using a certain tool and or software.

Please comment your phone model number below so we can be able to batter assist you.