There is already some method / tool, for unlocking the bootloader on equipment that the "service info" status is "no" which allows !
I wanted to finally leave the coustom roms and make real root, so I can install a kitkat rom ...
"First, you should confirm that it is possible to unlock the boot loader of your phone by checking the service menu. In your phone, open the dialler and enter *#*#7378423#*#* to access the service menu.
In your phone, tap Service info > Configuration > Rooting Status. If Bootloader unlock allowed says Yes, then you can continue with the next step. If it says No, or if the status is missing, your device cannot be unlocked."