We're now rolling out the Jelly Bean update for Sony Xperia E Dual
It may not be available for all countries/operators yet but try updating using PC Companion/Update service.
Availability and rollout timing will vary by market and customer variants
For further questions regarding Jelly Bean update for your specific market I recommend you to contact your local support:
http://www.sonymobile.com/global-en/support/contact-us/contact-info/
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