Default Help!! Bricked ace

Hi My friend gave me a bricked Ace. He told that he bricked it before and got it repaired. Now he bricked it again and those JTAGs won't work like they did earlier. I tried to get it to Samsung's but they told the motherboard went wrong. I don't think there is a problem with the motherboard. I think that after trying JTAG once the gold connectors were changed by the silver squares. And now they won't work even with JTAG.I tried taking it to different shops but none were able to JTAG it. So is it possible a USB jig might work