I have a MR3420 v2.3. Tried to flash it for the first time with the only software on site under "trunk"
http://downloads.openwrt.org/snapshots/ … actory.bin

It went pretty smoothly, its just that i had no idea it does not have a web interface. So, I decided to bring it back to the original firmware but somehow it failed. Now I have a router that keeps blinking all its lights.

I tried soldering the usb cable as well with tx,rx, and gnd. But this does not work either with tftp. I probably need a resistor for this cable to work properly. Problem: where to get it and secondly, according to instructions I need to connect TX and VCC while the usb is connected to pc.

I need help to:

1. Un-brick this Router
2. Install and firmware that has Luci or any other web interface.

Will the v1 firmware work on this?

Would appreciate any help.

(Last edited by farhansabir on 17 Sep 2014, 11:53)

What usb ttl serial adapter are you using? Post pictures of your connections..

First of all sorry for the delay.

I am using a standard USB cable from my phone charger. As mentioned before, I am using three cables as described at couple of websites i have seen so far. I have also been able to get hold of a 10k ohm resistor. If I connect VCC to TX with that resistor, will it work?

Pictures have been attached. Thank you for your help.

You need a ttl serial adapter, not a random usb cable!!

http://wiki.openwrt.org/doc/hardware/port.serial

hi can someone help to debrik 3420 v 2.3 i used dku-5

wich pin that i need to solder

thanks

pinout:

http://wiki.openwrt.org/toh/tp-link/tl-mr3420#serial

how to find out pins vs colors on a nokia cable:

http://buffalo.nas-central.org/wiki/Use … inkstation

i already see that. but still cannot understand .
i see the board diffrent for v2.3.
i cannot find sj1.
and in back board there is no TP18 to TP38 and TP28 to TP48

sorry for my bad english

Maybe its similar to 841 v8...

http://wiki.openwrt.org/toh/tp-link/tl- … al.console

hi nebbia88.
i already succes to get in to cosole.
but when i try to type "tpl" when autoboot in 1 second
but nothing happen.

can u help me

I have same problem, now I am able to connect serial console and show message in hyper terminal as follows. please help what script have to write to recover. My chipset is RTL8196c. Plzzz help

========== SPI =============
SDRAM CLOCK:156MHZ
 ------------------------- Force into Single IO Mode ------------------------
|No chipID  Sft chipSize blkSize secSize pageSize sdCk opCk      chipName    |
| 0 c22016h  0h  400000h  10000h   1000h     100h   86   39      MX25L3205D/E|
 ----------------------------------------------------------------------------

---RealTek(RTL8196C)at 2012.02.17-12:17+0900 version v1.1f [16bit](390MHz)
no sys signature at 00010000!
no sys signature at 00020000!
no sys signature at 00031000!
no sys signature at 00032000!
no sys signature at 00033000!
no sys signature at 00034000!
no sys signature at 00035000!
no sys signature at 00036000!
no sys signature at 00037000!
no sys signature at 00038000!
no sys signature at 00039000!
no sys signature at 0003A000!
no sys signature at 0003B000!
no sys signature at 0003C000!
no sys signature at 0003D000!
no sys signature at 0003E000!
no sys signature at 0003F000!
no sys signature at 00040000!
Set 8196C PHY Patch OK

---Ethernet init Okay!
<RealTek>ipconfig
 Target Address=192.168.1.6
<RealTek>