My 4 Gen with IOS 4.2.1 cannot connect iTune and I want to upgrade IOS.

My 4 Gen with IOS 4.2.1 cannot connect iTune and I want to upgrade IOS.
Q1) What's wrong with my touch that iTunes cannot detect it? What should I do?
Q2) Is there any method to upgrade IOS without connect to iTunes?

Have you lokked here. Do not omit the Addition Information paragraph if you have OSX 10.6
iOS: Device not recognized in iTunes for Mac OS X
Does it charge?

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