Rooted Xperia PRO MK16i stuck on bootloop all of a sudden.

[marian9913]

Hi,

After about a year from successful rooting my MK16i it stuck on bootloop.
Root process was conducted according to: http://xdaforums.com/showthread.php?t=1865796

To top it off I'm not able to do anything including:
1. Go into recovery mode ( Power button + Volume Down and all set of other keystrokes I could find in the net )
- after xperia logo's presentation the phone vibrates but before anything happens it boots again.
2. ReFlash kernel.
- I'm newbie but the reason could be USB DEBUGGING inactive - I'm not able to change that setting due to constant bootloop.
- below is the log from Flashtool:

02/058/2017 23:58:54 - INFO - Selected Bundle for MT11i. FW release : 4.1.A.0.562. Customization : CUSTOMIZED-NCB-Nordic
02/058/2017 23:58:54 - INFO - Preparing files for flashing
02/058/2017 23:58:54 - INFO - Please connect your device into flashmode.
02/059/2017 23:59:04 - INFO - Device connected in flash mode
02/059/2017 23:59:04 - INFO - Opening device for R/W
02/059/2017 23:59:04 - INFO - Reading device information
02/059/2017 23:59:05 - INFO - Phone ready for flashmode operations.
02/059/2017 23:59:05 - INFO - Opening TA partition 2
02/059/2017 23:59:05 - INFO - Current device : MK16i - CB5A1HENM0 - 1249-6015_R2I - 1243-7775_4.1.B.0.587 - WORLD-i_4.1.B.0.587
02/059/2017 23:59:05 - INFO - Closing TA partition
02/059/2017 23:59:05 - INFO - Start Flashing
02/059/2017 23:59:05 - INFO - Processing loader.sin
02/059/2017 23:59:05 - INFO - Checking header
02/059/2017 23:59:05 - ERROR - Processing of loader.sin finished with errors.
02/059/2017 23:59:05 - INFO - Ending flash session

Other facts (as mentioned before I'm a beginner - I just hope that these facts will support people in the know to help me solve the problem)
1. Once in a while I can see following message: System UID's inconsistent
-before I can do anything phone reboots itself again.
2. BOOTLOADER is probably locked. I didn't do anything to unlock it, at least deliberately.
3. I haven't installed any CWM Recovery or TWRP on my phone
4. I can go into FLASHBOOT mode but trying to flash TWRP.img a a kind of message comes up:

You're phone must be rooted....

(//actually it's rooted so I don't really know what's happening)

I went through many threads and tips but with no result...
Is there any way I can get my phone back - fix this repetitive bootloop? Please help.

 

[marian9913]

Solved

For everyone who might have similar issue (specifically with loader.sin finished with errors):
http://xdaforums.com/xperia-sp/help/sin-error-flashtool-t2846599/page2#post63419553

So the problem was flashtool itself.