[Sony Cross-Device General] Zap_12100:
Yesterday my Xperia P (LT22i), for whatever reason, soft-bricked itself. I left my phone asleep for about an hour and when I tried to wake it only the screen backlight worked. At the time my phone was unrooted, bootloader locked, with stock firmware 6.1.B.0.550.

Having not yet found this guide I hard reset the phone (oops) and turned it on again, but again it only responded with a black backlit screen.

I then attempted a repair via PC Companion but after repair the phone still wouldn't turn on.

At this stage I searched and found this guide. Following its instructions I allowed my phone's battery to run dry. Once it dried up I plugged it in charge for about two hours before flashing stock firmware. The red LED was still on at this point, so maybe I should've waited until it went away?

The flash was successful but again my phone still turns on to a black backlit screen, so I am basically where I was at the beginning. The phone does not charge when plugged in. This time I have not hard reset it.

Currently I am letting the phone's battery run dry again. but I know this will take a very long time and I'd like my phone back ASAP. I'm not sure if repeating the process will work since it didn't work the first time.

Thanks in advance for your help!

If it helps, here is the Flashtool log, although it looks perfectly normal.

07/029/2013 12:29:11 - INFO - <- This level is successfully initialized

07/029/2013 12:29:11 - INFO - Flashtool Version 0.9.10.1 built on 2013-01-09 19:49:47

07/029/2013 12:29:11 - INFO - You can drag and drop ftf files here to start flashing them

07/029/2013 12:29:21 - INFO - Device disconnected

07/050/2013 12:50:34 - INFO - Selected Sony Xperia P LT22i_ 6.1.1.B.1.54_Sony.ftf

07/050/2013 12:50:34 - INFO - Preparing files for flashing

07/051/2013 12:51:18 - INFO - Please connect your device into flashmode.

07/052/2013 12:52:21 - INFO - Device connected in flash mode

07/052/2013 12:52:22 - INFO - Opening device for R/W

07/052/2013 12:52:22 - INFO - Reading device information

07/052/2013 12:52:22 - INFO - Phone ready for flashmode operations.

07/052/2013 12:52:22 - INFO - Current device : LT22i - CB512031AD - 1262-3522_R4G - 1254-4233_6.1.B.0.550 - WORLD_6.1.B.0.550

07/052/2013 12:52:22 - INFO - Start Flashing

07/052/2013 12:52:22 - INFO - Processing loader

07/052/2013 12:52:22 - INFO - Checking header

07/052/2013 12:52:22 - INFO - Flashing data

07/052/2013 12:52:23 - INFO - Loader : S1_Root_3065 - Version : R5E003 / Bootloader status : ROOTABLE

07/052/2013 12:52:23 - INFO - Processing partition-image.sin

07/052/2013 12:52:23 - INFO - Checking header

07/052/2013 12:52:24 - INFO - Flashing data

07/052/2013 12:52:24 - INFO - Processing kernel.sin

07/052/2013 12:52:24 - INFO - Checking header

07/052/2013 12:52:25 - INFO - Flashing data

07/052/2013 12:52:27 - INFO - Processing fotakernel.sin

07/052/2013 12:52:27 - INFO - Checking header

07/052/2013 12:52:27 - INFO - Flashing data

07/052/2013 12:52:29 - INFO - Processing modemfs.sin

07/052/2013 12:52:29 - INFO - Checking header

07/052/2013 12:52:29 - INFO - Flashing data

07/052/2013 12:52:29 - INFO - Processing modem.sin

07/052/2013 12:52:29 - INFO - Checking header

07/052/2013 12:52:29 - INFO - Flashing data

07/052/2013 12:52:31 - INFO - Processing prcmu.sin

07/052/2013 12:52:32 - INFO - Checking header

07/052/2013 12:52:32 - INFO - Flashing data

07/052/2013 12:52:32 - INFO - Processing apps_log.sin

07/052/2013 12:52:32 - INFO - Checking header

07/052/2013 12:52:32 - INFO - Flashing data

07/052/2013 12:52:32 - INFO - Processing system.sin

07/052/2013 12:52:32 - INFO - Checking header

07/052/2013 12:52:32 - INFO - Flashing data

07/054/2013 12:54:47 - INFO - Processing userdata.sin

07/054/2013 12:54:47 - INFO - Checking header

07/054/2013 12:54:47 - INFO - Flashing data

07/054/2013 12:54:56 - INFO - Processing cache.sin

07/054/2013 12:54:56 - INFO - Checking header

07/054/2013 12:54:56 - INFO - Flashing data

07/054/2013 12:54:58 - INFO - Ending flash session

07/054/2013 12:54:58 - INFO - Flashing finished.

07/054/2013 12:54:58 - INFO - Please unplug and start your phone

07/054/2013 12:54:58 - INFO - For flashtool, Unknown Sources and Debugging must be checked in phone settings

07/054/2013 12:54:58 - INFO - Device connected in flash mode

07/055/2013 12:55:05 - INFO - Device disconnected