Asus Strix Tactic Pro Bricked (Firmware update failed, not recognize by PC anymore)

Hi guys. Can someone help me whith this? I bought it from a friend, a prize from Manila Major 2016. The first time I use it FN key not working, then i tried updating everything from strix software to its firmware. The first time I succeed, FN key worked already and all keys. But, after weeks of use I notice that FN key does not work again, then I tried repeat the steps i did the last time I made it to work but, while updating firmware it failed and when I disconnect and connect the keyboard it does not even recognize by my PC so cant update firmware anymore. Please someone help me. Thank you in advance.