Sony Xperia P bricked!

I was trying to root my phone. But unfortunately my phone is bricked. I tried to switch on but failed. Even the notification light is not coming. When I connect it with PC using fast boot mood my PC says to me **USB device not recognized**. Details on what I did: * I have downloaded [this file from Mediafire](http://mediafire.com/download.php?0431bxmta44peck) * I've unzipped it and there was an .elf file * Copied that .elf file in a folder that I've downloaded from [this link](http://hackmyandroid.com/use-adb-fastboot-commands-without-installing-android-sdk/2479) * Copied SuperUser [from here](http://downloads.noshufou.netdna-cdn.com/superuser/Superuser-3.1.3-arm-signed.zip) to the device's internal storage * switched off my phone and started the cmd there * Then executed fastboot flash boot keiran-recovery-st25.elf That brought up my issue then.