Yes its only for the models listed...fyi newegg is selling a bunch of the newer dahuas (sold and shipped) just like yours was...
The naming convention is rubbish too. I mean they release a new model but it's same as old model but tick the number up one so people want the new one etc.They do have a bunch of other models for sale, but none I would buy at the prices they are asking.
Sure that this works? If this would be true, everyone could change the admin password over internet... Really Bad BackdoorDahua Reset Password :
8888 x Day x Month x Year , and pick the last 6 digits
21/08/2014 = 8888 x 21 x 8 x 14 = 20904576,
So password : 904576
today's login: admin/706496