help_point

Hi mates, i have this custumer who have a dvr no brand no labels on it, and i try to take the cmos battery off, but even that is not working, i try the normal passcode: i have 2 user: admin AND 1 admin/admin admin / 123456 admin / 888888 admin / 21086000 1 / 111111 1 / 123456 etc etc etc any one know this model, and tell me what i have to do ??? please

ANY ONE ...PLEASEEEEE

hi there, yes i try admin with no password. is any way to reset the memory, because even i remove the battery don]t work