I have a nvr , I think it is the longse LS-N3525D (no type nr on device itself)
http://www.longse.com/Info/View_pro.asp?id=918
When it did work, i saw it has the hreospeed software (http://www.herospeed.net/herospeed/)
After a wrong firmware update it doens't boot anymore, it hangs on the...