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Hi there!

I recently bought an Xperia SP and had it unlocked fully so now i can use any SIM.

But it seems that there is a problem: my phone is slow. I only have a handful of apps installed, nothing is programmed or working in the background or Sync is turned off.

I checked the OS and it is still stuck to Android 4.1.2 but the official Sony Mobile website says the latest is 4.3.

Is there an app to help speed up my phone?

Why is my phone not detecting the 4.3 update?

Please advice. Thanks.
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