Downgrade Nexus 4 from 4.4 to 4.2 I have recently updated  my Nexus from 4.3 to 4.4 . But having an immediate requirement i would like to downgrade back to 4.2 . I originally bought it with 4.2. 

Any step by step to downgrade back are highly recommended.
tried factory reset but of no luck. Is rooting mandatory for this? I have read some where that factory images are helpful. Please throw some light on this and a step by step document is needed being a layman on this?
this might helps.
https://android.stackexchange.com/a/50728/39466

Pretty much details process from XDA forums
http://forum.xda-developers.com/showthread.php?t=2010312