[Q] My Xperia SP(c5302) is not turning on topic

Hi,
I was trying to install a custom rom as instructed in http://forum.xda-developers.com/show....php?t=2735975
I used Philz recovery. Unfortunately i wiped the whole system and my rom installation failed :(
Now my phone is not turning on (it only shows Sony screen) :(

I've been pressing all the button combinations (power + volume up; power + volume down; power + vol up + vol down), and nothing happens, no vibration, only Red LED blinking when pressing power button whatsoever.
The only "vital" sign it gives is the Red LED when you plug it on the charger or on the USB on the PC.

Is my phone dead permanently ? Is there any way to recover my phone?

Any help, suggestion, thought from personal experience is appreciated!