Cant't go to fastboot mode

[jackreacher]

I turned off my phone and connect the USB to PC by hoalding volume up(+) button but its show the error message as shown. Please hepl me..!!!

[elshah]

have the pc installed the ZEUS Flash Device? I cant view the picture you attach until it past the moderation.

[jackreacher]

Let me explain clearly

I was trying to unlock the bootloader with this procedure http://unlockbootloader.sonymobile.com/instructions

Everything went fine till 11th step.

Acoording to the 12th step when i tried to connect the device in Fastboot mode my PC showed "Device Not Recognised"(it had shown like this when I tried before also). ok I just ignored it. 

In the 13th step it says "On your computer, you will be asked for drivers" but I wasn't asked for any drivers. I mean any sort of Window popup asking for drivers(I don't know what should have happened at this step). But I proceeded to the next step.

According to the 14th step I opened the command window and went into the tools folder within the Android SDK folder.

According to 15th step i entered  fastboot.exe -i 0x0fce getvar version but it shows "WAITING FOR DEVICE" in the Command Window. I got stuck here.

As Google has disabled driver singnature enforcement in Windows 8. I even checked whether ADB drivers were installed, it was installed, no problem with that.

So what might be the problem??Please someone reply ASAP

[elshah]

AHAHAHAHA, my bad, i think you want to flash the stock rom in your device. maybe this will help. i also got the problem on my xperia go, but i manage to fix it. Here, hope it will help you.
install the s1 fastboot driver. follow this instruction. :

download this and install it . link : http://www.flashtool.net/download.php

after finish install go to local disk c >flashtool>drivers. you will find flashtool-driver inside there. open it and find Fastboot Driver and tick it. After that install it.

If you still have problem by unlocking the bootloader by official method, try this, i unlock the bootloader on my xperia miro and xperia go by using this application.it works! it should work on you too.

link downlod> http://www.ulozto.net/xdgy6dv/se-bootloader-unlocking-relocking-1-6-rar
your computer must be running net.framework v4 (google it) for this application to work. 
hope this will help.

BY UNLOCKING THE BOOTLOADER YOUR DEVICE WILL LOSE EVERYTHING STORED ON INTERNAL STORAGE AND PHONE MEMORY.