Just forget that any android version exist further. It takes time for developers to decode to add all the features as per the manufacturers requirements and policies. They cannot give you a buggy OS upgrade. They need to maintain the quality with proper testing so that you always remain satisfied and happy. Those who gives you OS upgrades easily and fast do not actually work out on bugs and glitches. They just push the updates which leads to multiples bugs in the devices. Its important to understand that the developers do actually care about your device. So just keep patience and use your device for the purpose its made for and NOT for the excitement about how the new OS feels like.
