[Q] how to update with stock full rom

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http://forum.xda-developers.com – Hi, i just bought my galaxy nexus 2 days ago.. and after update via OTA, my device was updated from ICS to JB (4.1.1) but after waiting 2 days, i am eager to update to 4.1.2.. at first i tried with incremental update from 4.1.1 to 4.1.2.. and failed with status 7, installation aborted.. confused with it, then i proceed with full stock ROM.. but when i download the 4.1.2 full rom (Factory Images "yakju" for Galaxy Nexus "maguro" ) from "https://developers.google.com/android/nexus/images" i confused.. i received a tgz file where inside of it is unfo (HowTos)