i have tp link 703 v 1.6 . flashed it with openwrt-ar71xx-generic-tl-wr703n-v1-squashfs-factory.bin, then using telnet gave password. Using Putty changed network configurations, like this (vi /etc/config/network

config interface 'loopback'
option ifname 'lo'
option proto 'static'
option ipaddr '127.0.0.1'
option netmask '255.0.0.0'

config interface 'lan'
option ifname 'eth0'
option type 'bridge'
option proto 'static'
option ipaddr '192.168.1.140'
option netmask '255.255.255.0

option gateway '192.168.1.1'
list dns '8.8.8.8'
list dns '193.232.248.2'

config 'interface' 'wan'
option 'ifname' 'ppp0'
option 'pincode' '1234'
option 'device' '/dev/ttyUSB0'
option 'apn' 'internet'
option 'service' 'umts'
option 'proto' '3g'

saved it ( [ESC][ESC] ???? Z Z ). then connected tp link 703 to my home router (also tplink,), after this i cannot connect to my tp link via putty 192.168.1.140. Somebody Please tell, what wrong am i  doing?