Telnet Zte F6640 Guide
Note: Many modern ISPs push configuration files that overwrite these defaults, meaning the password is unique to your specific unit's serial number or randomly generated.
telnet 192.168.1.1
sendcmd 1 DB set TelnetCfg 0 InitPort 2323 sendcmd 1 DB set TelnetCfg 0 LocalPort 2323 sendcmd 1 DB save telnet zte f6640


