Z3 D6603 Android 5.1.1

Hi All,
New to forum, have followed some guides before with my old Samsung S3.

Now have a Sony Xperia Z3 which I am delighted with...apart from an issue I encountered just today.

Basically I went to read a text, message app crashed, repeated to go view message app a few times but same result.
Decided to restart phone, booted up and checked again - all texts now gone...vanished!

Anyway I want to recover them as some messages are important to me and upcoming events.
I've read I have to root my device to attempt recovery of these texts.

I also read, months ago to be fair, rooting the Z3 also unlocked the bootloader which as a result screwed with the DRM keys and quality of the camera (which was amazing in my recent Rome trip!).


Basically I want to root my device, not break my camera quality, not loose my DRM keys and attempt recovery of missing texts (with third party windows apps most likely).

Can this be done?

Found this guide but it doesn't mention the DRM keys so I am unsure:
http://forum.xda-developers.com/z3/g...stall-t3017056


Any help is appreciated
Regards,
F