Elie

I have a DVR model: 6104ZXW-p1 Compression: h.264 it came with samsung 4 cameras i downloaded the xvr app and all worked i changed my password and confirmed. password was wrong and now i cant access my dvr all passes are wrong. i removed the battery and back, i tried admin, 123456 etc i googled every way. im still stuck on NULL password is still wrong any help??