Touch Screen not working after flashing

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http://forum.xda-developers.com – Good morning. Yesterday, I tried to update my Sony Ericsson Xperia U, from version 2.3.7 to version 4.0.4 with the official software of sony. After upgrading, I noticed that the performance was very bad, and wanted to go back to version 2.3.7 again. I searched this forum, and I did with the Flashtool and st25i Iberia stock 2.3.7 rom. My surprise was that after flashing and booting the phone, the touch screen had stopped working, ie unresponsive. After this disaster, I picked up the official Sony software to try to return the version 4.0.4 in order to revive the mobile, but unfortunately, the t (HowTos)