Sony Xperia Z3

HEy,
I had a sony Xperia Z3 which was given to me by a friend. There is one little problem! There is a pin code! The phones USB debugging is not on and The phone is also not rooted. And my friend would only give this phone to me if i can get his pictures and videos that are stored in this phone. In this case what can i do to remove the pincode without deleteing any files from my phone.
Any help would be appreciable!
Thanks,

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