[Some Questions] Rooting the Z3 nowadays

[Pyro Phoenix]

Well then,
I've managed to get a used Z3 as a replacement for my old SGY Duos. Definitively a real improvement

Now i want to get root - becoming the REAL owner of this phone. So i've asked google - and got soo much information, that I dont know, which solution would be the best one / up to date one. The D6603 got the latest Build .291 onto it.

Questions:

A: Which one is the most recent root method for this device? (Ideally without downgrading and such ...)
B: Will I loose DRM Keys in the process of rooting or won't these get lost until unlocking the Bootloader?

Couldn't figure out ... either too much or too less information out there.

Thanks, folks!

 

[jimmy123322]

A: Through unlocking bootloader and installing TWRP or other custom recovery
B: Do a TA Backup

 

[Dandroidd]

Oye perdona la ignorancia

A: Through unlocking bootloader and installing TWRP or other custom recovery
B: Do a TA Backup

Si es posible desbloquear el bootloader ser usuario root
Sin perder las claves MRD y por ende todos las mejoras
Que ofrece el software patentado de Sony?
De ser así como lo hago?
Aunque la verdad preferiría poder ser root sin abrir el bootloader