[Xperia SP Q&A, Help & Troubleshooting] lucgre:
Seems working, maybe just dont got the good firmware? Still bootloop

16/030/2015 07:30:26 - INFO - Flashtool Version 0.9.19.10 built on 04-10-2015 21:00:00

16/030/2015 07:30:26 - INFO - Executing search strategies to find proxy selector

16/030/2015 07:30:26 - INFO - No proxy found for IE. Trying next one

16/030/2015 07:30:26 - INFO - Strategy firefox failed trying next one : No Firefox installation found

16/030/2015 07:30:26 - INFO - No proxy found for java. Trying next one

16/030/2015 07:30:26 - INFO - Syncing devices from github

16/030/2015 07:30:27 - INFO - Scanning devices folder for changes.

16/030/2015 07:30:31 - INFO - Pulling changes from github.

16/030/2015 07:30:32 - INFO - Devices sync finished.

16/030/2015 07:30:32 - INFO - Device disconnected

16/031/2015 07:31:06 - INFO - Flash canceled

16/031/2015 07:31:33 - INFO - Selected Bundle for Sony Xperia SP (C5306). FW release : 12.1.A.0.266. Customization : USGeneric

16/031/2015 07:31:34 - INFO - Preparing files for flashing

16/032/2015 07:32:55 - INFO - Please connect your device into flashmode.

16/033/2015 07:33:08 - INFO - Device connected in flash mode

16/033/2015 07:33:09 - INFO - Opening device for R/W

16/033/2015 07:33:09 - INFO - Reading device information

16/033/2015 07:33:09 - INFO - Phone ready for flashmode operations.

16/033/2015 07:33:09 - INFO - Opening TA partition 2

16/033/2015 07:33:09 - INFO - Current device : C5303 - YT910Q04TQ - 1272-3352_R1B - 1272-3352_12.1.A.1.207 - GLOBAL-LTE_12.1.A.1.207

16/033/2015 07:33:09 - INFO - Closing TA partition

16/033/2015 07:33:09 - INFO - Start Flashing

16/033/2015 07:33:09 - INFO - Processing loader.sin

16/033/2015 07:33:09 - INFO - Checking header

16/033/2015 07:33:09 - INFO - Flashing data

16/033/2015 07:33:10 - INFO - Loader : S1_Root_7054 - Version : R5G006 / Boot version : R11B023 / Bootloader status : NOT_ROOTABLE

16/033/2015 07:33:10 - INFO - Max packet size set to 64K

16/033/2015 07:33:10 - INFO - Making a TA backup

16/033/2015 07:33:10 - INFO - Opening TA partition 1

16/033/2015 07:33:10 - INFO - Start Dumping TA partition 1

16/033/2015 07:33:16 - INFO - Finished Dumping TA partition 1

16/033/2015 07:33:16 - INFO - TA partition 1 saved to C:\Users\***\2015-10-16_07-33-10\1.ta

16/033/2015 07:33:16 - INFO - Closing TA partition

16/033/2015 07:33:17 - INFO - Opening TA partition 2

16/033/2015 07:33:17 - INFO - Start Dumping TA partition 2

16/033/2015 07:33:18 - INFO - Finished Dumping TA partition 2

16/033/2015 07:33:18 - INFO - TA partition 2 saved to C:\Users\***\2015-10-16_07-33-10\2.ta

16/033/2015 07:33:18 - INFO - Closing TA partition

16/033/2015 07:33:19 - INFO - No flash script found. Using 0.9.18 flash engine

16/033/2015 07:33:19 - INFO - Opening TA partition 2

16/033/2015 07:33:19 - INFO - Writing TA unit 00002774. Value : [01]

16/033/2015 07:33:19 - INFO - Closing TA partition

16/033/2015 07:33:20 - INFO - Processing partition-image.sin

16/033/2015 07:33:20 - INFO - Checking header

16/033/2015 07:33:20 - INFO - Flashing data

16/033/2015 07:33:23 - INFO - Opening TA partition 2

16/033/2015 07:33:23 - INFO - Closing TA partition

16/033/2015 07:33:23 - INFO - Opening TA partition 2

16/033/2015 07:33:23 - INFO - Processing amss_fsg.sin

16/033/2015 07:33:23 - INFO - Checking header

16/033/2015 07:33:23 - INFO - Flashing data

16/033/2015 07:33:25 - INFO - Processing amss_fs_1.sin

16/033/2015 07:33:25 - INFO - Checking header

16/033/2015 07:33:25 - INFO - Flashing data

16/033/2015 07:33:27 - INFO - Processing amss_fs_2.sin

16/033/2015 07:33:27 - INFO - Checking header

16/033/2015 07:33:27 - INFO - Flashing data

16/033/2015 07:33:28 - INFO - Processing apps_log.sin

16/033/2015 07:33:28 - INFO - Checking header

16/033/2015 07:33:28 - INFO - Flashing data

16/033/2015 07:33:30 - INFO - Processing cache.sin

16/033/2015 07:33:30 - INFO - Checking header

16/033/2015 07:33:30 - INFO - Flashing data

16/033/2015 07:33:34 - INFO - Processing fotakernel.sin

16/033/2015 07:33:34 - INFO - Checking header

16/033/2015 07:33:34 - INFO - Flashing data

16/033/2015 07:33:37 - INFO - Processing kernel.sin

16/033/2015 07:33:37 - INFO - Checking header

16/033/2015 07:33:37 - INFO - Flashing data

16/033/2015 07:33:41 - INFO - Closing TA partition

16/033/2015 07:33:42 - INFO - Opening TA partition 2

16/033/2015 07:33:42 - INFO - Processing system.sin

16/033/2015 07:33:42 - INFO - Checking header

16/033/2015 07:33:43 - ERROR - Processing of system.sin finished with errors.

16/033/2015 07:33:43 - INFO - Ending flash session

16/033/2015 07:33:43 - ERROR -

16/033/2015 07:33:43 - ERROR - Error flashing. Aborted

16/033/2015 07:33:43 - INFO - Flashing finished.

16/033/2015 07:33:43 - INFO - Please unplug and start your phone

16/033/2015 07:33:43 - INFO - For flashtool, Unknown Sources and Debugging must be checked in phone settings

16/033/2015 07:33:44 - INFO - Device connected in flash mode

16/033/2015 07:33:45 - INFO - Device disconnected

16/033/2015 07:33:47 - INFO - Device connected in flash mode

16/034/2015 07:34:04 - INFO - Device disconnected