nhow to root sony Xperia Z1 C6902 with Android 5.1.1

hello to all
I have sony xperia C6902 with android 5.1.1 OS
and frimware 14.6.A.1.236
I try King root...Iroot .....Vroot.....with Latest version of this softwares....
I can't root anyway......:confused::(
Help me How can I root my sony????!!!

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