Google has finally release Android 4.2.1 updates to fix some issues found on Android 4.2, especially the calendar bug which oddly enough didn’t include the month December. The update is currently rolling out to Google Nexus 7 and Galaxy Nexus. As usual only certain regions are receiving the update.
Now thanks to the awesome peeps at XDA you can manually update your Nexus 7 and Galaxy Nexus
You can install the update to your device via ADB if you have a stock recovery by using adb sideload, or from the internal storage if you’re running a custom one. This is a relatively safe operation, but back up the important stuff anyway.