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Hello, i tried to install the 10.4.1.B.0.101 update in my Xperia Z, but after the phones restarts, it gives me a warning that the update could not be installed or failed. It happend everythime i tried to install this update. I tried it in sony companion but the same thig. It displays an error message..
When i run the app, it says "NO NETWORK" 
Do you have a good internet connection?
Yes i have a good internet connection.
Orange Internet 1mbps
That internet connection is on your phone but you need to run sus on your computer.
Heres a screen shot of the problem ! i ran the software from my PC !
If your PC has a firewall installed, make sure that it's set to allow Update Service. The problem is that Update Service is unable to connect to our servers from your PC and internet connection for some reason.
I've checked the firewall settings and its all good but still get this network problem.
Is you internet connection using any proxy? You may be able to see that under Controlpanel -> Internet options -> Connections -> LAN settings but if you're using some type of software for the connection you may not be able to see the settings here.