Unhappy [Q] Bell Z upgraded to 4.3 while rooted and now my bootloader is unlockable! help :(

Hello everyone!

Here is my perplexing dilemma, I rooted my Z at 4.1.2 and had no issues running any rooted Apps. I felt like holding off on any custom ROMs until i checked out the new 4.3 so I updated it and then I lost my root and my bootloader said I can not unlock it. Do I have to downgrade to root it again or is there something i am missing??

I appreciate any help that I can get due to my lack of experience with this but my high interest in it.