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Hi there. I've updated my Xperia U to ICS and when I'm turning on the phone is connecting to WiFi, show that I've got updates, then suddenly the internet connection is not working anymore. Neither HSDPA or WiFi. The ICS was flashed manually. What can I do? 
Thanks in advance.
Sounds like there was an issue loading the firmware in which case I would have to advise that you run a repair:
1. Before you start you have to download the PC Companion software from http://www.sonymobile.com/gb/tools/pc-companion/
and install it on your PC.
2. Once installed on your PC, double-click the PC Companion icon on your desktop to start the update.
Note! For some models you will be prompted to do a backup prior to the update and then restore.
3. Install and open PC Companion then select Support Zone.
4. Phone Software Update.
5. Start.
6. Repair Phone
7. Continue
8. Accept data removal
9. Next
10. Wait for prepare
11. Select Phone
12. Follow the connection
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i also get the same problem , i try many time using pc companion to repair . also no work .