it could be ur router is bricked. u may try this step to unbrick ur router without serial: -

https://forum.openwrt.org/viewtopic.php?id=38953

no worries. i had once bricked MR3420 with OpenWrt. a fren help me to solder the serial pin and i debrick successfully.

my advise is never flash openwrt via wireless
flash openwrt using LAN and configure static IP instead of DHCP

My router led is still on like normal.  At starting the sys led will blinking fast and after that its stay..  If i plug wan,  wan led lights up like normal and if i plug 3g, vice versa.  Is that consider brick?
I already check that im not sharing the connection,  but at network map it say multi something(forgot the full name) i think maybe because of that i cant access luci.  But where to disable the sharing network?

Got another way to flash stock fw without login 192.168.1.1? Haha!
I'll try again later.  If still fail then rip my router...  Haha!  Thanks chuah!

http://downloads.openwrt.org/attitude_adju...hfs-factory.bin
beta 2 out. expert chuah got try it?

hope can solve the usb port no display at the choose device screen

how the heck do i even use this? 
openwrt not working with gcom, dont have such command in openwrt list

yeah, put into putty but no respond, type help to see usable list, no # gcom insde

it works 

a little weird on how it translate signal rate, signal quality is 17,99 , means what?? dunno how interpret

i dont game, only surf, so.. hard to tell

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Added on November 1, 2012, 10:31 pm
no money for things now

if only i can know what kinda max speed is possible in my area oh well, live with what i have now.. still better than TM

same here, haha 1m only choice, place too old

I can get full wifi signal with Network disabled. Poor connection. from the router on my phone but ofcoz have no internet connection. and the Light lights up like normal. but still, cant open 192.168.1.1. is that consider my router is brick?

i increased the transmit power tu 27dBm
but why in the status, it still shows that the Tx-power is 21dBm?
already reboot the router

as stated in the picture
US bcoz it is the default one i think, flash openwrt using ur video as a guide
thx for the video

you're right. here's a list of maximum transmit power for the TP-Link routers that I have:
1. WR1043ND - 23dBm
2. MR3420 - 21dBm
3. MR3020 - 18dBm

nope, i dint set auto ping, will try normal use 1st...

thanks for your video teaching using putty to set the internet to router

how to download zte mf680 bin file?

yup got ready thanks,but after this few day,my phone seem to be cannot detect ip address from this mr3420,it can detect wifi,but when i connect the wifi from my ipad,phone,it say no network.

yes my pc ok,but with same setting,yesterdau my ipad,phone can detect,but after today cannot detect already,i check setting on my phone it show no ip address.