[Q] How to verify Nexus 4 factory image ? topic

Hi guys,

Yes I purchased a used Nexus 4 & I only want original & genuine factory rom on it, & not any custom rom so that I can get future updates by Google. So guys please help me to verify its integrity. Also I am experiencing default launcher is getting crashed every time when I am moving forward to the widget section after apps on page 4.

Thanks,
AJ