HT4623 i have iphone 4 with 4.3.2 version, i want to upgrade the software. but my phone is not getting synchronised on itunes and not getting detected. please help me

i have an iphone 4 with 4.3.2 version, i want to upgrade the software. but my phone is not getting synchronised on itunes and not getting detected. also there is no update software tab under settings.please help me

If your phone isn't being recognized by your computer, you need to follow the steps in this article to resolve that
Also, some basic isolation needs to be done. Does it show up in itunes on any other computers? do you have other cords you can test with to see if it might be the cord? if the phone doesn't show up on any computers, it's likely your phone has a hardware issue
http://support.apple.com/kb/TS1538?viewlocale=en_US is the article to use if you want to concentrate on trying to get a particular computer to recognize your phone

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