copying image file

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http://forum.xda-developers.com – hello i have been having a lot of problem with my gnex gps since i got it. yesterday i got a second one because my wife took my first one :) now, on the new gnex, the gps works fast and locks quickly; but not to a lot of satellite. nonetheless, it works and that is what matters. what i want to do now, is copy the phone OS image from the new gnex to the old one. how do i do it without rooting or unlocking the new gnex? or would you suggest i get the factory image and flash it tot he old gnex? btw, both run 4.1.1. help on this matter is sought with great impatience. tia (HowTos)