Default [Q] HDC S4 legend HARD BRICKED Help!!!

Hello all.A few days ago i bought and hdc S4 legend.it worked correctly for 2-3 days and then suddenly it turn off.I did not flush it or root it.I did not make anything.The phone now is hard bricked and it does not respond at all.it does not charge, not open, is not detectable from my pc, it is completely dead.i have the stock rom backup as many other roms too.i am trying to flush it with SPflashTools but as it is not detectable from pc i can not flush it.Please tell me how i can make it detectable for a few seconds to flush it with SPtools?If there is no way which is the test point for this phone?thanks
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