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Is there no official update, but has someone created a ROM that you could install on your rooted device? Then you need to look out Buy Girls Party Dresses Online how to update unofficially.
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If there is no official update for your device, you either need to wait for one (if one will be made) or install a custom ROM. There is a vibrant mod community that works very hard to make new OS updates available for old devices and devices where the manufacturer/carrier is very slow to do their Cheap Formal Dresses customizations.