[Xperia SP Q&A, Help & Troubleshooting] ivica122:
May i ask for help!! I had RR 5.0.2 for LB on my Xperia SP and i wanted to try Pac rom 4.4.4. So, my phone was rooted, recovery installed and it was working fine with RR.

I entered recovery and wiped everything to install new rom but i didn't flash new rom, i restarted my phone and wanted to go in recovery again, but recovery was gone and phone now won't start. I get Sony logo at start and nothing else. Now, i'm not absolute beginner, i have flashtool on my PC and i downloaded original Sony firmware and tried to flash it but for the first time in my life, this is not working!! I get this:

16/024/2016 17:24:41 - INFO - Preparing files for flashing
16/024/2016 17:24:58 - INFO - Please connect your device into flashmode.
16/025/2016 17:25:05 - INFO - Device connected in flash mode
16/025/2016 17:25:06 - INFO - Opening device for R/W
16/025/2016 17:25:06 - INFO - Reading device information
16/025/2016 17:25:06 - INFO - Phone ready for flashmode operations.
16/025/2016 17:25:06 - INFO - Opening TA partition 2
16/025/2016 17:25:06 - INFO - Current device : C5303 - YT910L0P0A - 1272-3352_R1B - 1272-3352_12.1.A.1.207 - GLOBAL-LTE_12.1.A.1.207
16/025/2016 17:25:06 - INFO - Closing TA partition
16/025/2016 17:25:06 - INFO - Start Flashing
16/025/2016 17:25:06 - INFO - Processing loader.sin
16/025/2016 17:25:06 - INFO - Checking header
16/025/2016 17:25:06 - INFO - Flashing data
16/025/2016 17:25:11 - INFO - Loader : S1_Root_7054 - Version : R5G006 / Boot version : R11B023 / Bootloader status : UNROOTABLE
16/025/2016 17:25:11 - INFO - Max packet size set to 64K
16/025/2016 17:25:11 - INFO - USB buffer size set to 512K
16/025/2016 17:25:11 - INFO - No flash script found. Using 0.9.18 flash engine
16/025/2016 17:25:11 - INFO - Opening TA partition 2
16/025/2016 17:25:11 - INFO - Writing TA unit 00002774. Value : 01
16/025/2016 17:25:11 - INFO - Closing TA partition
16/025/2016 17:25:12 - INFO - Processing partition.sin
16/025/2016 17:25:12 - INFO - Checking header
16/025/2016 17:25:12 - INFO - Flashing data
16/025/2016 17:25:16 - INFO - Opening TA partition 2
16/025/2016 17:25:16 - INFO - Processing boot.sin
16/025/2016 17:25:16 - INFO - Checking header
16/025/2016 17:25:17 - INFO - Flashing data
16/025/2016 17:25:19 - INFO - Closing TA partition
16/025/2016 17:25:20 - INFO - Opening TA partition 2
16/025/2016 17:25:20 - INFO - Processing amss_fsg.sin
16/025/2016 17:25:20 - INFO - Checking header
16/025/2016 17:25:20 - INFO - Flashing data
16/025/2016 17:25:23 - INFO - Processing amss_fs_1.sin
16/025/2016 17:25:23 - INFO - Checking header
16/025/2016 17:25:23 - INFO - Flashing data
16/025/2016 17:25:25 - INFO - Processing amss_fs_2.sin
16/025/2016 17:25:25 - INFO - Checking header
16/025/2016 17:25:25 - INFO - Flashing data
16/025/2016 17:25:27 - INFO - Processing apps_log.sin
16/025/2016 17:25:27 - INFO - Checking header
16/025/2016 17:25:27 - INFO - Flashing data
16/025/2016 17:25:30 - INFO - Processing cache.sin
16/025/2016 17:25:30 - INFO - Checking header
16/025/2016 17:25:30 - INFO - Flashing data
16/025/2016 17:25:35 - INFO - Processing fotakernel.sin
16/025/2016 17:25:35 - INFO - Checking header
16/025/2016 17:25:35 - INFO - Flashing data
16/025/2016 17:25:40 - INFO - Processing kernel.sin
16/025/2016 17:25:40 - INFO - Checking header
16/025/2016 17:25:40 - INFO - Flashing data
16/025/2016 17:25:45 - INFO - Closing TA partition
16/025/2016 17:25:46 - INFO - Opening TA partition 2
16/025/2016 17:25:46 - INFO - Processing system.sin
16/025/2016 17:25:46 - INFO - Checking header
[COLOR="Red"]16/025/2016 17:25:47 - ERROR - Processing of system.sin finished with errors.[/COLOR]
16/025/2016 17:25:47 - INFO - Ending flash session
16/025/2016 17:25:47 - ERROR -
[COLOR="red"]16/025/2016 17:25:47 - ERROR - Error flashing. Aborted[/COLOR]
16/025/2016 17:25:47 - INFO - Flashing finished.
16/025/2016 17:25:47 - INFO - Please unplug and start your phone
16/025/2016 17:25:47 - INFO - For flashtool, Unknown Sources and Debugging must be checked in phone settings
16/025/2016 17:25:47 - INFO - Device connected in flash mode
16/025/2016 17:25:49 - INFO - Device disconnected

Any ideas, please help?!?!

EDIT EDIT EDIT

I found solution on net. Problem is not in phone, problem is in flashtool. Xperia SP is not working with latest version. I downloaded previous version and flashing was successful!!!!!