Most people may have brought the Android 4.2 update on their devices. However, the Android 4.2 came with an ultra-embarrassing bug. That is there are only 11 months per year in the calendar component. After November, the calendar welcomes the next January. There exists no December, which is said to be swallowed by the Android robot. Recently, Google rolled out the Android 4.2.1 update to fix this bug exclusively. Users who have rooted their Nexus 4 could upgrade Android 4.2 via OTA. It is noted that this OTA update is available in batch process. So, if you don’t root your devices, you have to wait for the notice. You can attach to this blog. I would provide more latest information.