Follow this thread, very detailed procedure with all links needed.
How-to: root, keep and backup DRM keys, etc. | Sony Xperia Z3 Compact | XDA Forums
How-to: root, keep and backup DRM keys, etc. | Sony Xperia Z3 Compact | XDA Forums
This is too long in need a simple one! I just got a z3 compact a few months ago. Iv never used android before.
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