Default Xperia SP bootloop

Hi everyone,I restarted my Xperia SP because it didn't show the volume (I changed the design) bar and now it's stuck in a bootloop and it also gets very hot (sometimes you see the lockscrenn but it restarts again).

I tried connecting it to PCC but it isn't recognized. Pressing the OFF button on the back also doesn't work.

The bootloader is locked, there's no custom recovery and it's not rooted running stock Android 4.3.

I hope you can help me.


Sincerly,
DerGräflicheGraf