How to unlock pattern on Nexus 4 [Developer Option: ON]
Okay I finally got it solved using a developer way. :)

Here's my reference for my solution: Turn on wifi via self-made android applicaiton 

Got the wifi the moment I compiled into my Nexus phone, and volla! It works and I got my phone back after login through Google account!

I hoped this thread might helped people who came across this problem as a developer.