Xperia Z3 (T-Mobile) D6616 Android 6.0 Not Found

Hi,
I've Xperia Z3 (T-Mobile) D6616 running on Android 5.0. I would like to install Android 6 on it.

I prefer to install Stock Rom of Android 6 On my Z3. Default :(, If there are a cool & good :D Custom ROM of Android 6.

I was not able to root it using Kingo Root too :crying: !!! Are there another way ?

Thanks

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