Since the blog "Crack android screen lock and "factory data reset" lock" is the 2nd HOT in my blog, so I put the APK here, as a tool for those who don't know programming. Do hope it can resolve your problem :P
# Special offer: Download the APK
some of you might not familiar with programming, or Android SDK, just download the APK below, follow the instructions to enter your phone again.
https://www.dropbox.com/s/gtb10s65sl0bn7m/crack_screenlock.apk
#1, Plug in your phone to your PC/MAC
#2, run command to install the APK, then start it
adb install crack_screenlock.apk
adb shell am start -n com.test.adm/.UnlockerActivity
#3, you will see the screen lock disappeared. If you will do a lot of operations , you'd better change the screen timeout to a bigger value. Otherwise, you might see the screen lock again..
#4, Make a factory reset, just click the "Reset this phone" button. System will ask you to assign some power to the application. Click "Activate".
#5, After you click "Activate", screen will show "Power off", then phone will run the reset program.
If anything didn't work properly, write comment below.