Xperia St26a bricked? topic

A friend gave me his Xperia St26a (Xperia J I believe) to fix it because its stuck in a screen with a warning logo, a blue arrow and a phone laying down but I can't boot the phone or get to bootloader or recovery using hardware keys, PC doesn't recognize the phone and it looks completely dead to me but i'd like to know if theres anything else I can do to fix this phone, I tried volume down+power and volume up+ power so many times and it doesn't do anything, it doesn't even show if its charging when i have it plugged on my PC.
My friend said either his WiFi went down or phone shutted down while updating and then all this started happening, is there anything I can do?

Thanks in advance :)