I'll give you more details now, about my problem.
1.- My phone was OK (rooted and with CWM) running Hackit custom rom.
2.- I install RomAur, then on reboot the phone got stuck on sony logo (it means, sony logo, and then reboot, sony logo and then reboot, infinite loop). Pressing OFF button (back next to the SD) it restarts the phone but the infinite loop continues.
3.- I installed flashtool (drivers, etc)
4.- I run the phone and then pressing VOL DOWN and plugin the usb cable at the same time it puts on yellow light (i dont know what mode it is). Infinite loops stops, phone is off and battery charging icon is displayed.
5.- On yellow light then i disconnect the phone and then pressing VOL DOWN and reconnecting flashtool recognize it ("28/024/2013 20:24:13 - INFO - Device connected in flash mode"). No light on the phone. If i do the same but with VOL UP it runs fastboot (blue light).
6.-On flashmode, I press the flash device button (black beam icon), it ask for mode, i choose flashmode. Then i select the ftf. and flashtool displays
28/043/2013 20:43:29 - INFO - Preparing files for flashing
28/044/2013 20:44:07 - INFO - Device disconnected
And the infinite loop returns...
If i pressthe powe off button nothing happens, it vibrates only one time, every restart on the loop
HELP! and thanks for your answers