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The m477fdn has automatic two-sided printing and the m477fnw has manual. Also the m477fnw has built-in wi-fi whereas the other one does not.
Sorry, there was a problem. Please try again later.The m477fdn duplexes (two-sided printing). The m477fnw does not. That is the only difference (besides the price). I checked with HP, you cannot purchase a duplexing option for the m477fnw.
Sorry, there was a problem. Please try again later.The two other answers have it half right. I can tell you definitively that the following are the differences... m77fnw: no auto duplexing; wireless printing m477fdn: auto duplexing; no wireless printing m477fdw: auto duplexing; wireless printing Why HP decides to switch up their features like this is anyone's guess. It just makes it confusing. Nonetheless, those are the differences.
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