Just as the Android code guru with a three letter name promised, Android 4.2.1 factory images are now available for the Nexus 4, Nexus 7, and Nexus 10 as well as the GSM version of the Galaxy Nexus. The release comes about 48 hours after the Jelly Bean update first started making its way to owners of the Google-branded devices. The source code was made available the same day as part of the Android Open Source Project.
Also available are Android 4.2.1 binaries for the Nexus 10, Nexus 7, and both the “toro” (Verizon) and “maguro” (GSM) versions of the Galaxy Nexus. Oddly, there is no binary available for the Nexus 4 at this time. We’re guessing that version will be available shortly.
While the newly available resources might not be immediately useful, a factory image is always a good thing to keep around should you run into any trouble with your device (especially if you are the type to root and tinker). It will make restoring your handset or tablet to working order a much easier process.