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[Q] Keep root and recovery with locked bootloader after upgrading to Lollipop?

Hi guys,
My girlfriend has a Xperia Z3, currently not rooted, bootloader is locked, no custom recovery and running Kitkat. I'm planning on rooting her phone for her install TWRP just to make a backup of the ROM, then I will update it to Lollipop right after.
I want to keep the bootloader locked because from what I've read, unlocking bootloader wipes the DRM keys or something, which apparently affects camera and even battery life for some people. I know I can back up the TA partition but that doesn't fix the fact that the camera will be affected somehow. I just don't want to take the risk and deal with the possibility.
So how would I root and install TWRP on a locked bootloader Xperia Z3 running Lollipop? I haven't seen any topics or guides on this, most are for phones with UNLOCKED bootloader so it's not really helping...

Read the Guide in the general section for rooting a locked bootloader

http://forum.xda-developers.com/z3/general/guide-rootrecovery-how-to-root-install-t3017056
You haven't researched much i see..
If you have 23.0.A.2.93 version, all you need is to Root, install TWRP, then FLASH a pre-rooted Lollipop rom.

I've read that guide already and I don't see any pre-rooted LP roms for either New Zealand or Taiwan. I know it probably won't matter, but for phones like Samsung Galaxy S5, we have CSC codes which basically gives you access to certain apps or options depending on the country of the ROM. If possible, I'd like to update to Lollipop from the official OTA and then root it from there.
Also, I'm on a newer KK firmware, which means I'll need to downgrade in order to get root. But doing that also means I lose all the contents on the phone, which I want to backup first using Titanium Backup. I understand there's a sacrifice here but I'm a bit confused as to why we couldn't just flash recovery using fastboot (like most other phones do) and then install SuperSU from TWRP? Or is the downgrade necessarily in order for us to achieve root via an unpatched exploit?
UPDATE:
Forgot to mention one major issue, my girlfriend's Z3 is D6653. The 23.0.A.2.93 firmware for D6653 is for T-MOBILE, but my girlfriend's phone is an international variant so I'm not sure it's compatible.

you know you can flash a rom with flashtool and not have it wipe the data?

sony z3 d6653 lolipop 23.4.A.0.546 root help

i unlocked the bootloader but theirs no way to root without downgrading to kk..
is theres a way fo rooting with this update can i have it
im new to sony and had a bricked problem yesterday
played a little bit with flash tool and managed to get out of it with the Unlocked bootloader..

And you were aware of such keywords like "camera DRM", "TA partition", "backup" before unlocking, right?
I've aswered you elsewhere too, but, the procedure is kinda universal (for Z phones that is): downgrade to KK, giefroot, XZDR, update to pre-rooted LL.
What's your issue with that? You do it once and you just flash the next version, keeping data, but wiping dalvik&cache.

i didnt keep the drm backup...
now i dont think i can restore it
it doesnt matter all i need to do it to root this and have the full power to my self

done and rooted and everything works fine..now i nned toknow if theres any pure android marshmellow available??

...
To root with an unlocked boot loader is the easiest thing, just flash an insecure kernel.
As for ROMS, head over to the development section and take a browse there.

gregbradley said:
...
To root with an unlocked boot loader is the easiest thing, just flash an insecure kernel.
As for ROMS, head over to the development section and take a browse there.
Click to expand...
Click to collapse
what is an insecure kernal??
im bit affraid coz i flashed a kernal and it ran into a bricked mode and had to use a stock rom flash via flashtool to recover it
i have the unlocked bootloader eka what can i do to update and how can i ??
can you please give me a guide link
thanks a lot man

Downgrade to lollipop :/ ?

If i downgrade my Xt1541 which has marshmallow stock rom on it , without flashing bootloader.img or gpt.bin , would that all go to plan ?
Also, if I accepted an ota update when on lollipop, would it hard brick my phone, and if it did , would there be a recovery method?
Because if I accepted an upgrade back to marshmallow via ota, surely it would not break the bootloader because it is upgrading to the one which is already there? correct me if I am wrong.
Thank you for any advice with this

I downgraded mine without flashing those two files and it worked perfectly and I see no reason why an OTA wouldn't work. You'll have to unlock your bootloader to downgrade though.

root z3 6633

Hi
I have a Sony Xperia Z3 Dual (D6633)
Android Lollipop 6.0.1 Build 23.5.A.0.570 ( Original-Stock firmware )
Locked bootloader
I want to root it without flashing any new firmware, and without unlocking the bootloader
Just Rooting
If someone can make a video explaining, I'm using the translate BR .
thanks

For now, there is no known way to root this firmware w/o unlocking bootloader. Best way to obtain root is to downgrade to KK, get Root and recovery, and then flash pre-rooted MM firmware. Here is very good tutorial for that: http://forum.xda-developers.com/z3/general/guide-rootrecovery-how-to-root-install-t3017056.
Also, I don't recommend to unlock the bootloader. bacause you'll get almoust only downsides.

Relocking Bootloader WITHOUT flashing

So I have stock 5.1 on my XT1033, rooted and bootloader unlocked. I wish to un-root and relock the bootloader (for security reasons?) but without having to go through the trouble of flashing the stock firmware since I already am on stock.
Do I really need to flash the stock firmware in order to re-lock? If not, then how do I re-lock?
TIA.

the relocking of bootloader will change nothing. flash Nought Roms & try Magisk Root Manager to hide root in important applications like banking.
and go for nought rom which is way better than 5.1.