[Q] Locked bootloader , can i downgrade to root.

i recently bought a bell xperia z1, went on to the sony website to unlock bootloader to find that mine is locked, unlike the international version which has an unlockable bootloader.

ive updated it to see if the updates would unlock the bootloader but alas they did not, now im running :

model c6906
android 4.3
build 14.2.A.0.209

Main question :
Will i be able to downgrade and bypass the bootloader?
ive rooted a S2/Htc HD/ Desire Z in the past im just worrying about bricking my phone that ive had for less then a week.

and all other guides ive seen are for different versions, ive heard of flashing the 6903 stuff but that makes me worry way to much.

so pretty much want to know is it possible to do via downgrade to achieve root or should i just wait till a safer method becomes available.

sony bloatware is annoying

you sir are the man, followed the video and got root, now to find a rom to use.

edit : went to install a rom + gapps and had to do the whole process over again. right from flashing nuts custom. got stuck in a sony logo boot loop. zz

so attempt #2 with a different rom.

edit 2: was able to update to 4.4 kitkat so now i hope i can update my rom. since i was trying to do a 4.4 rom on the 4.3 firmware ?

edit3: nope stuck on sony logo so went back to nuts again... hrmm well atleast i could upate to 4.4 going to try boot to cwm and see if that works

i was able to go back and use flash tool to flash nut's ftf

so im on 4.4 kitkat rooted which is good.

but when i flash any custom rom trough any recovery it boot loops im guessing its because locked bootloader.

so im guessing any rom i want to flash has to have 2 parts. The flashing process in recovery and the flashtool flash firmware for that rom.

unless like you said update my kernal