Trying to reset password of a no-name DVR (Sy-2004? HD DVR – 2004?))

[Hut5579 0]

Hi,

It just says "2004" on a sticker on back of the DVR, I found it's picture and it's this which calls it "HD DVR – 2004" and also this on a Chinese site that calls it "Sy-2004". How can I reset it's password?

Thanks.