What happened when they tried to unbrick it? Is the board/chip damaged?Take it to a service center or you can have Samsung repair it. It will probably be cheaper at a service center. They should be able to diagnose and figure out the problem. If the person that was trying to jtag it knew what they were doing and you can't write to the board at all. Then you would need to replace the logic board. That's one of the most expensive pieces right along with the LCD replacement. You can either get it new for $1XX or buy a similar one from a broken phone on Ebay that is still functional and replace it. Just make sure its the same model. Can you turn the phone on at all? Or is it stuck at the boot screen? Can you go into recovery mode?