I need help with my Z3 (root)

Hello everyone, and sorry for the inconvenience , I need help with my phone, the problem is that my phone is android 6.0.1 and 23.5.A.0.575 Marshmellow and D6603 , I need help to make root , I tried reading some tutorials , but , all say I should do this by TWRP but not how to install it, and try everything, any help me please QWQ

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