frayed1 Posted May 11, 2014 Share Posted May 11, 2014 I am putting in the right serial number but i keep getting error message 521 Quote Link to comment Share on other sites More sharing options...
batmanroxus Posted July 29, 2014 Share Posted July 29, 2014 Me too, I'm getting ( Error: 521) when trying to register my 500X Quote Link to comment Share on other sites More sharing options...
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