Sony Xperia SP (C5303) BootLoop.

[Goba96]

Hi guys!

I wanted to install a custom rom to my Sony Xperia SP (C5303) phone. I rooted it with KingRoot and wanted to boot into fastboot with the help of Quick Boot (Reboot) apk from the play store.
I pressed Bootloader button on the app, and since then my phone is in bootloop. If I hold the power button down, nothing happens, not even vibration. I can't remove battery (isn't removable) and can't turn it off. How can I fix this? I didn't even unlocked the bootloader.

Thanks for your answers in advance.

 

[James L]

Keep holding power until it shuts off. Hold volume down and power, while holding the buttons plug it in. Then download a FTF for your device and use flashtool to flash it.

 

[Goba96]

My problem is it doesn't shut down. I've tried a lot of method: holding volume up + power. It should vibrate but in my case, it doesn't.

 

[Slug]

Sony devices tend to differ from most others in that they don't have the usual recovery options. Fastboot Mode is accessed, with the device powered off, by holding Vol_Up and then connecting to PC via the USB cable.

To force a shutdown: remove the back cover, and depress the OFF button with the tip of a pen (or similar). After a few seconds the phone should vibrate and power down.

In addition to the advice above by @James L, Sony's PC Companion software suite will also allow a "repair installation" of the most recent firmware to be done.