[AC Question]

I want to master reset the phone but don't remember the lockscreen password.

[sfoLAX]

Hello. It will still be tied to your Google account and password at the time it was locked.
You can reset it via Recovery Mode using the hardware buttons.
The procedure depends on the device.

[B. Diddy]

Welcome to Android Central! See this guide: http://forums.androidcentral.com/amb...read-here.html