sony ericsson android 4.0.2.A.0.42 update with unlocked bootloader

[CJ9620]

So a couple months ago i unlocked the bootloader for my sony ericsson xperia ray,in order to root it. Now if i update it to the 4.0.2.A.0.42 version it bricks.. probertly the cause of the unlocked bootloader.Is there any way to update or to undo the unlocked bootloader?
tx

 

[CJ9620]

nvm..
already found a way to "relock"
then i was able to update to 2.3.4