In Windows OS
Start/Run/cmd.exe
telnet ip_adress_of your_dvr
ex: telnet 192.168.1.108
If you know IP of your DVR ofcouse and if this adress in the same subnet with your PC
To know IP use netview or similar program.
If you do not know how to do this ask smart guys near you!
thank you so much
1. i know how to start telnet and the adresse ip, but the problem is telnet also ask you about the password
2. i couldn't find the firmware