If you have the 5.6.2.1 firmware then it's most probably a "PW 2" ("6th generation Paperwhite" = "2013" / "2014"), not a "PW 1".
As of today, the current "PW 1" ("5th generation Paperwhite" = "2012" = "pre 2013") firmware is 5.6.1.1.
But if you bought it very recently and the firmware is 5.6.1.1 then it could be a "PW 3" ("7th generation Paperwhite" = "2015") -> see (thanks "knc1" for pointing this out):
https://www.mobileread.com/forums/sho...d.php?t=262279