Xperia z5 BL UNLOCKING ERROR

[hander13]

Hello, i need help about my xperia z5, i try to unlock my bl via flashtool but when i put unlock code i took this error ''FAILED (remote: Command not allowed)''. What i have to do to fix this error?
I posted my device status and flashtool logs.

 

[gm007]

Did you allow the option in developer menu?
And make sure to backup TA partion before unlocking.

 

[hander13]

Did you allow the option in developer menu?
And make sure to backup TA partion before unlocking.

Thank so much....two nights for this f***ing developer option!! Ohhh God...