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After trying to update my xperia s to android 4 at about 3 times by pc companion my xperia s don´t boot, when i boot it only vribrates and appears SONY on the screen. It´s the first time i use the phone, i'm charging it now, but still only appears SONY on the screen. Any ideas?
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Anytime
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charge your phone (wall charger) wait an hour then use SUS instead
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Update Service (SUS)
http://www.sonymobile.com/gb/tools/update-service/
http://www-support-downloads.sonymobile.com/Software%20Downloads/Update_Service_Setup-2.11.12.5.exe
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
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Ok i tryed after 30 minutes of charge but in the mid of process the download of update fail. I´ll try to charge more.
the issue is your computer or internet connection, turn off your firewall and antivirus also reinstall JAVA
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I can´t even charge my phone, the notification led is red when i charge but after a time he boot and reboot then back to red light. And the charger is not warming very strange 
Try this
connect your phone to the wall charger > press and hold the power button and volume Up for 5 seconds > let it charge for an hour, then try to turn it back on
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When i press and hold the power button and volume Up for 5 seconds, nothing happens, and the phone is charging for more than 1 hour. But after a time it begins to restart for 1 minute and then back to charge (the led is still red) and i can´t boot or update with SUS because the phone isn't charged 
just try my suggestion, if that doesn't work, and neither another wall charger or usb cable, the only option is to take it to a sony repair center or return it to the store
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LOL My Xperia S has just ressurect. I let it charging on notebook via USB and went to the bakery, then when i back the PC Companion had repaired and upgraded it. Now it´s with ics and can be normally charged. I just let it plugged on notebook and the PC Companion did all the work. Thanks at all.