xperia z1 update failed usb cannot be read by pc

[khian3605]

I tried to update my Sony Xperia Z through Pc Companion to android kitkat..my pc just  shut down and the update has been interrupted . And from that point on, when i try to open the phone it says " the software update failed, make sure the phone is connected to the computer and try again " and blacks out... i tried plugging the phone to 3 of our pc at home yet pc cannot read/ detect the device 

[_alexdon_]

Charge your device for about 1 hour at a wall socket,turn it off and perform a repair with PCC:

http://www.sonymobile.com/gb/tools/pc-companion/