(First, the built-in software of the 831 must be flashed to version 2.79, which can be downloaded from zte (how to flash in the instructions). The factory-set Ethernet port IP address of the 831 is 192.168.1.1. In order to be able to access the 831 with telnet, Let's first set the address of a computer to 192.168.1.
, Use ping192.168.1.1 to see if you can access 831. If there is no problem, continue.)