SONY LT18I 刷機後無法開機

Sony LT18I 刷機後無法開機
再刷幾個版本會出現如下錯誤 ( lt18i_4.1.B.0.431_ready-to-root.ftf )

25/053/2015 19:53:35 - INFO  - <- This level is successfully initialized
25/053/2015 19:53:35 - INFO  - Flashtool Version 0.9.11.0 built on 2013-06-04 22:50:00
25/053/2015 19:53:40 - INFO  - Device disconnected
25/053/2015 19:53:48 - INFO  - Selected lt18i / 4.1.B.0.431 / ready to root
25/053/2015 19:53:48 - INFO  - Preparing files for flashing
25/054/2015 19:54:03 - INFO  - Please connect your device into flashmode.
25/054/2015 19:54:46 - INFO  - Device connected in flash mode
25/054/2015 19:54:46 - INFO  - Opening device for R/W
25/054/2015 19:54:46 - INFO  - Reading device information
25/054/2015 19:54:47 - INFO  - Phone ready for flashmode operations.
25/054/2015 19:54:47 - INFO  - Current device : LT18i - CB5A1D9Y4Q - 1255-1481_R8D - 1253-8238_4.0.2.A.0.62 - WORLD-i_4.0.2.A.0.62
25/054/2015 19:54:47 - INFO  - Start Flashing
25/054/2015 19:54:47 - INFO  - Processing loader
25/054/2015 19:54:47 - INFO  - Using an unofficial loader
25/054/2015 19:54:47 - INFO  - Device loader has not been identified. Using the one from the bundle
25/054/2015 19:54:47 - INFO  -     Checking header
25/054/2015 19:54:47 - INFO  -     Flashing data
25/054/2015 19:54:52 - INFO  - Loader : S1_Loader_Root_773f - Version : R4A066 / Bootloader status : ROOTED
25/054/2015 19:54:52 - WARN  - This file is ignored : simlock.ta
25/054/2015 19:54:52 - INFO  - Processing kernel.sin
25/054/2015 19:54:52 - INFO  -     Checking header
25/054/2015 19:54:52 - INFO  - Ending flash session
25/054/2015 19:54:52 - ERROR - ERR_SEVERITY="MAJOR";ERR_CLASS="SECURITY_CLASS";ERR_STATIC="SIN_HEAD_VER";ERR_DYNAMIC="Failed to verify sin header";
25/054/2015 19:54:52 - ERROR - Error flashing. Aborted
25/054/2015 19:54:53 - INFO  - Device connected in flash mode
25/054/2015 19:54:54 - INFO  - Device disconnected
25/054/2015 19:54:56 - INFO  - Device connected in flash mode
25/054/2015 19:54:59 - INFO  - Device disconnected

25/054/2015 19:54:52 - ERROR
25/054/2015 19:54:52 - ERROR - Error flashing. Aborted
如上錯誤
肯請網上朋友救救

SONY LT18I 更新軔體後開機出現 SONY 後三角行中間驚嘆號跟手機圖樣
用FLSAHTOOL 刷機出現錯誤
ERR_SEVERITY="MAJOR";ERR_CLASS="SECURITY_CLASS";ERR_STATIC="SIN_HEAD_VER";ERR_DYNAMIC="Failed to verify sin header";
誰可以救救我的手機

開機後logo後就出如圖是甚麼原因該如何出處理