Pues creo que ha habido problemas al hacer root, os pego el log del flashtool a ver si esto es normal
04/031/2013 20:31:00 - INFO - <- This level is successfully initialized
04/031/2013 20:31:00 - INFO - Flashtool Version 0.9.9.0 built on 2012-11-13 22:53:30
04/031/2013 20:31:00 - INFO - You can drag and drop ftf files here to start flashing them
04/031/2013 20:31:04 - INFO - Device connected with USB debugging on
04/031/2013 20:31:04 - ERROR - Cannot identify your device.
04/031/2013 20:31:04 - INFO - Selecting from user input
04/031/2013 20:31:15 - INFO - Connected device : LT18
04/031/2013 20:31:15 - INFO - Installed version of busybox : N/A
04/031/2013 20:31:15 - INFO - Android version : / kernel version : / Build number :
04/031/2013 20:31:15 - INFO - Phone in recovery mode
04/031/2013 20:31:15 - INFO - Root Access Allowed
04/031/2013 20:31:46 - INFO - Device disconnected
04/032/2013 20:32:37 - INFO - Device connected with USB debugging on
04/032/2013 20:32:37 - INFO - Connected device : LT18
04/032/2013 20:32:37 - INFO - Installed version of busybox : BusyBox v1.18.5 (2011-07-18 07:43:28 PDT) multi-call binary.
04/032/2013 20:32:37 - INFO - Android version : 4.0.4 / kernel version : 2.6.32.9-perf / Build number : 4.1.B.0.587
04/041/2013 20:41:21 - INFO - Pushing C:\Flashtool\.\devices\LT18\busybox\1.20.0\busybox to /data/local/tmp/busybox
04/041/2013 20:41:21 - INFO - Pushing C:\Flashtool\custom\root\subin\Supersu\su to /data/local/tmp/su
04/041/2013 20:41:21 - INFO - Pushing C:\Flashtool\custom\root\subin\Supersu\Superuser.a pk to /data/local/tmp/Superuser.apk
04/041/2013 20:41:23 - INFO - Please look at your device and click RESTORE!
04/041/2013 20:41:23 - INFO - You have 60 seconds to follow the restore advice
04/041/2013 20:41:23 - INFO - Running adbrestoreexploit
04/041/2013 20:41:23 - INFO - Root hack did not work. Cleaning hack files