I cant relock my sony z3

[ReDeemar]

hi 

i have unlocked my bootloder on sony z3 dual. 

now i want to relock it to update the phone.

i saw on xda a simple methode using flashtool , i tried it but it's still unlocked.

so is there another thing that i can use to relock it again ? 

[Uliwooly]

@ReDeemar

That's the only way. 

[ReDeemar]

then why it's not working ? even though im using the lastest version of flashtool 

[Thommo]

Did you click on BLU and follow the guide