Default [Q] Bricked Optimus GJ (e975w) Please help!

I'm sorry if I posted in the wrong section, but I am desperate. After rooting my Optimus GJ, at that time I passed over unlocking the bootlock and now my device just shows me the secure boot error. I can't find anywhere the kdz file for my device, and I just don't know what to do. Please! Any help is greatly welcomed.