Like a trail of breadcrumbs, Nexus factory images are your safe way back
Google has posted a pair of new factory images on the Google Developers site today, allowing folks using a Verizon Galaxy Nexus to have access to the 4.2.2 software, and folks with the Sprint version to grab a copy of the 4.2.1 files. These images are a must have if you like to do any sort of tinkering to your Nexus, as they allow you to restore everything to the stock state with a simple fastboot flash.
It's also a testament to just how hard Google works with partners to get licensing issues sorted so they can post the bits that aren't open source. We take this sort of thing for granted, but I'm sure we shouldn't.
If you have either of these Nexus phones, follow the link below and download your safe way back. Here's hoping you never need them, but thank goodness they're there.
Source: Google Developers