Xperia z locked bootloader

[haroonlatif]

Hi I have xperia z. bought from friend. locked to Three uk. got it unlocked. it is bootloader is locked and in config it says you cannot unlock it. I am developer and I would like to work on sony xperia z ASOP project. will you be able to help me unlock the bootloader or make it unlockable.

[Arjun]

First you can flash the stock firmware ftf using flashtool download the file from http://forum.xda-developers.com/showthread.php?t=2223827

then follow the steps here http://forum.xda-developers.com/showthread.php?t=2153261

[GeoffH]

if the bootloader is locked by the carrier there is no way to unlock it - currently impossible as far as I know

[Arjun]

Sometimes flashing the generic firmware works

It worked for my friend.