How to update iphone 4 baseband?

hey guys i did a research on google and read lots of pages but i couldnt find an answer to my question.here it is.
i restored my iphone 4 today because i was having prox.sensor issues.and after restore i realized it didnt update my baseband.in fact at the end of restore process itunes gave me 1004 error and i used kick out of recovery solution.
im having reception issues as well and i dont know exactly if baseband update will help it improve but i want to update my baseband.
so my question is:
why didnt itunes update my baseband after restore?
and is it really fixing the reception/prox.sensor issues?
thank you.i dont know too much about iphone so please dont get upset if im asking something stupid.

iOS: How to update your iPhone, iPad, or iPod touch

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