[Xperia Arc Q&A, Help & Troubleshooting] Mowstyl:
Hi,

I'm trying to flash a stock rom to my Sony Ericsson Xperia Arc S (LT18i).

Flashtool works well until flashing of system.sin start, where it fails while checking headers.

I've already installed flashtool drivers.

This are the logs:

22/003/2017 01:03:24 - INFO - Selected Bundle for SonyEricson Xperia Arc S(LT18i). FW release : 4.1.B.0.587. Customization : (1254-2716)
22/003/2017 01:03:24 - INFO - Preparing files for flashing
22/003/2017 01:03:25 - INFO - Please connect your device into flashmode.
22/003/2017 01:03:38 - INFO - Device connected in flash mode
22/003/2017 01:03:38 - INFO - Opening device for R/W
22/003/2017 01:03:38 - INFO - Reading device information
22/003/2017 01:03:38 - INFO - Phone ready for flashmode operations.
22/003/2017 01:03:38 - INFO - Opening TA partition 2
22/003/2017 01:03:38 - INFO - Current device : LT18i - CB5A1JMRPH - 1255-2667_R3I - 1253-8238_4.1.B.0.587 - WORLD-i_4.1.B.0.587
22/003/2017 01:03:38 - INFO - Closing TA partition
22/003/2017 01:03:38 - INFO - Start Flashing
22/003/2017 01:03:38 - INFO - Processing loader.sin
22/003/2017 01:03:38 - INFO - Checking header
22/003/2017 01:03:38 - INFO - Flashing data
22/003/2017 01:03:43 - INFO - Loader : S1_Loader_Root_773f - Version : R4A066 / Boot version : R9B030 / Bootloader status : UNROOTABLE
22/003/2017 01:03:43 - INFO - Max packet size set to 64K
22/003/2017 01:03:43 - INFO - USB buffer size set to 512K
22/003/2017 01:03:43 - INFO - No flash script found. Using 0.9.18 flash engine
22/003/2017 01:03:43 - INFO - Disabling final data verification check
22/003/2017 01:03:43 - INFO - Disabling final verification
22/003/2017 01:03:43 - INFO - Opening TA partition 2
22/003/2017 01:03:43 - INFO - Writing TA unit 00002774. Value : 01
22/003/2017 01:03:43 - INFO - Closing TA partition
22/003/2017 01:03:43 - INFO - Opening TA partition 2
22/003/2017 01:03:43 - INFO - Closing TA partition
22/003/2017 01:03:43 - INFO - Opening TA partition 2
22/003/2017 01:03:43 - INFO - Processing adsp.sin
22/003/2017 01:03:43 - INFO - Checking header
22/003/2017 01:03:43 - INFO - Flashing data
22/003/2017 01:03:45 - INFO - Processing amss.sin
22/003/2017 01:03:45 - INFO - Checking header
22/003/2017 01:03:45 - INFO - Flashing data
22/003/2017 01:03:52 - INFO - Processing amss_fs_ayame.sin
22/003/2017 01:03:52 - INFO - Checking header
22/003/2017 01:03:52 - INFO - Flashing data
22/003/2017 01:03:52 - INFO - Processing cache.sin
22/003/2017 01:03:52 - INFO - Checking header
22/003/2017 01:03:52 - INFO - Flashing data
22/003/2017 01:03:54 - INFO - Processing fota0.sin
22/003/2017 01:03:54 - INFO - Checking header
22/003/2017 01:03:54 - INFO - Flashing data
22/003/2017 01:03:55 - INFO - Processing fota1.sin
22/003/2017 01:03:55 - INFO - Checking header
22/003/2017 01:03:55 - INFO - Flashing data
22/003/2017 01:03:56 - INFO - Processing kernel.sin
22/003/2017 01:03:56 - INFO - Checking header
22/003/2017 01:03:56 - INFO - Flashing data
22/003/2017 01:03:58 - INFO - Closing TA partition
22/003/2017 01:03:58 - INFO - Opening TA partition 2
22/003/2017 01:03:58 - INFO - Processing system.sin
22/003/2017 01:03:58 - INFO - Checking header
22/003/2017 01:03:59 - ERROR - Processing of system.sin finished with errors.
22/003/2017 01:03:59 - INFO - Ending flash session
22/003/2017 01:03:59 - ERROR -
22/003/2017 01:03:59 - ERROR - Error flashing. Aborted
22/003/2017 01:03:59 - INFO - Flashing finished.
22/003/2017 01:03:59 - INFO - Please unplug and start your phone
22/003/2017 01:03:59 - INFO - For flashtool, Unknown Sources and Debugging must be checked in phone settings

I've downloaded more than one .ftf file, no one works.

The phone was "bootloader unlock allowed: no", so it's not unlocked.

Now the phone can't boot, it can only be put to service mode (green led).

Thanks in advance