The button combination to enter recovery menu on some android devices are messed up or not even possible an its easier to enter into fastboot mode on those devices. So if you are with one of those just watch the video below.
Button combinations to enter fastboot on various devices.
Hold volume up press power button for about 3 secs then select fastboot from menu.
Hold volume down press power button for about 3 secs then select fastboot from menu.
Hold volume down then press power button for about 30 secs.
Hold volume up then press power button for about 30 secs.
Hold back button and connect device to PC (sony xperia).
Download an install adb setup from here
Launch command prompt from start menu (Click START and type CMD then press ENTER key)
Connect your device to PC in fastboot mode using any of the methods above
To check if device is connected in fastboot mode, type fastboot devices
When you see random numbers displayed then your phone is connected successfully
To reset your device, type fastboot reset userdata
Wait for process to complete.
Disconnect and boot device.
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