mobile

hi friends
Xda is doing good things to android.
I have xperia m single sim.
By using towel root i have rooted
Phone .
Now to flash cwm
I need to unlock bootloader.
I have installed minimal adb and
Fastboot.
When i try flashtool
I see no blu icon.
Is there any other way to unlock?
I got key from sony.
My android is 4.3
Where am i go wrong?

If anyone can help
I would appriciate