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I just updated my phone to ICS, using samsung galaxy GT-I900G, now whenever I charge my phone using USB, there is a circle icon and the network connection is lost. My machine does not recognize my phone as well. USB error.

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For the second part: have you installed the USB drivers? –  Bryan Denny Jun 5 '12 at 13:00
    
yea. installed usb drivers. tested my phone on another computer. it detected samsung galaxy s3, plugged in this s2, device not recognised. –  Saravana Kumar Narayanan Jun 5 '12 at 14:54
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