Pufff... hipertorpe que es uno.
Realizado el proceso y NO root
Este es el contenido del log de Flashtool... (no si si ahí se verá dónde está el problema)
15/050/2012 18:50:00 - INFO - <- This level is successfully initialized
15/050/2012 18:50:00 - INFO - Flashtool Version 0.8.0.0 built on 2012-05-27 21:57:12
15/050/2012 18:50:00 - INFO - You can drag and drop ftf files here to start flashing them
15/050/2012 18:50:07 - INFO - Device connected with USB debugging on
15/050/2012 18:50:07 - INFO - Connected device : MT15
15/050/2012 18:50:08 - INFO - Installed version of busybox : BusyBox v1.18.4 (2011-04-04 18:40:20 CDT) multi-call binary.
15/050/2012 18:50:08 - INFO - Android version : 4.0.4 / kernel version : 2.6.32.9-perf
15/050/2012 18:50:08 - INFO - Root Access Allowed
15/051/2012 18:51:21 - INFO - Selected MT15_4.1.B.0.431_Global.ftf
15/051/2012 18:51:21 - INFO - Preparing files for flashing
15/051/2012 18:51:31 - INFO - Please connect your device into flashmode.
15/051/2012 18:51:44 - INFO - Device disconnected
15/052/2012 18:52:05 - INFO - Device connected in flash mode
15/052/2012 18:52:05 - INFO - Opening device for R/W
15/052/2012 18:52:05 - INFO - Reading device information
15/052/2012 18:52:05 - INFO - Phone ready for flashmode operations.
15/052/2012 18:52:05 - INFO - Start Flashing
15/052/2012 18:52:05 - INFO - Flashing loader
15/052/2012 18:52:08 - INFO - Loader : S1_Loader_Root_773f - Version : R4A066 / Bootloader status : NOT_ROOTABLE
15/052/2012 18:52:08 - INFO - Disabling final data verification check
15/052/2012 18:52:08 - WARN - This file is ignored : simlock.ta
15/052/2012 18:52:08 - INFO - Flashing kernel.sin
15/052/2012 18:52:10 - INFO - Flashing fota1.sin
15/052/2012 18:52:11 - INFO - Flashing fota0.sin
15/052/2012 18:52:12 - INFO - Flashing vendor.sin
15/052/2012 18:52:51 - INFO - Ending flash session
15/052/2012 18:52:51 - INFO - Flashing finished.
15/052/2012 18:52:51 - INFO - Please wait. Phone will reboot
15/052/2012 18:52:51 - INFO - For flashtool, Unknown Sources and Debugging must be checked in phone settings
15/052/2012 18:52:51 - INFO - Device connected in flash mode
Lo que si me ha borrado es la agenda de contactos... y no me quiere recuperar la que había guardado en la tarjeta de memoria. Una ruina
__Saludos__