[Q] Root 14.2.A.1.136 w/ locked bootloader. - Sony Xperia Z Ultra

Hello, I have used the Z Ultra for about 4 months now. But recently, I somehow managed to shatter the display. As the phone was under accidental cover, I gave it to the service center people and got a new piece in return, which was already updated to 14.2.A.1.136.
Now, I was using the GPE ROM before, and would like to go back to it. But firstly, I would have to back up the TA Partition and unlock. But I checked the threads and all TA Backup methods need root. And I didn't find the method to root locked device on .136 anywhere on this thread. And in no way am I going to unlock before backing TA.
So can anybody please throw some light on my situation. Apologies if such a question has already been asked, I couldn't find any.
Help appreciated.

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Check this out
http://forum.xda-developers.com/showthread.php?t=2630781
Sent from my C6806_GPe using Tapatalk

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LordManhattan said:
Check this out
http://forum.xda-developers.com/showthread.php?t=2630781
Sent from my C6806_GPe using Tapatalk
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Thank you for the article!
Unfortunately, the OP's steps are a little complicated.
Would you mind to elucidate it a little for me?
:fingers-crossed:
EDIT: I got the rest of it. Just what does this mean?
Get a rooted .290 install then continue from below "Upgrading from .290 already rooted Locked BL"
To get root on .290 follow below or [NUT]'s/jackie's stock .290 for locked BL
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Here: http://forum.xda-developers.com/showthread.php?t=2602878
Sent from my C6806_GPe using Tapatalk

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Someone should re-write that mess
If you want to run a custom ROM (GPe etc) then you have to unlock the BL after rooting and backing the TA up. So:
Downgrade to .532 using [NUT]'s FTF - see my downgrade thread
Root using Bin4ry's root tool - see LordManhatton's thread for all thees next steps
Back up TA
Unlock BL
Flash latest firmware
Flash dual recovery (I use jackie's one)
Flassh ROM as needed or SuperSu is staying on Stock

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Make it a sticky for the noobies out there
Sent from my C6802 Monxdified ROM

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skylinestan said:
Make it a sticky for the noobies out there
Sent from my C6802 Monxdified ROM
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blueether said:
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Hahaha...becoz there's alot noobies asking for same question everywhere
Sent from my C6802 Monxdified ROM

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skylinestan said:
Hahaha...becoz there's alot noobies asking for same question everywhere
Sent from my C6802 Monxdified ROM
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We have a good thread (although a little cumbersome) that is stickied. I even think it points to this thread, well it points to the .290 version but it is the same method?