Hi!

I have problem with my TL-WR741ND v4.20. Router rebooting over and over. How can I fix this?

Serial output:

U-Boot 1.1.4 (Sep 14 2011 - 16:30:24)

AP121-2MB (ar9330) U-boot

DRAM:  32 MB
led turning on for 1s...
id read 0x100000ff
flash size 4194304, sector count = 64
Flash:  4 MB
Using default environment

In:    serial
Out:   serial
Err:   serial
Net:   ag7240_enet_initialize...
No valid address in Flash. Using fixed address
No valid address in Flash. Using fixed address
: cfg1 0x5 cfg2 0x7114
eth0: 00:03:7f:09:0b:ad
ag7240_phy_setup 
eth0 up
: cfg1 0xf cfg2 0x7214
eth1: 00:03:7f:09:0b:ad
athrs26_reg_init_lan
ATHRS26: resetting s26
ATHRS26: s26 reset done
ag7240_phy_setup 
eth1 up
eth0, eth1
Autobooting in 1 seconds
## Booting image at 9f020000 ...
   Uncompressing Kernel Image ... Too big uncompressed streamLZMA ERROR 1 - must RESET 

U-Boot 1.1.4 (Sep 14 2011 - 16:30:24)

AP121-2MB (ar9330) U-boot

DRAM:  32 MB
led turning on for 1s...
id read 0x100000ff
flash size 4194304, sector count = 64
Flash:  4 MB
Using default environment

In:    serial
Out:   serial
Err:   serial
Net:   ag7240_enet_initialize...
No valid address in Flash. Using fixed address
No valid address in Flash. Using fixed address
: cfg1 0x5 cfg2 0x7114
eth0: 00:03:7f:09:0b:ad
ag7240_phy_setup 
eth0 up
: cfg1 0xf cfg2 0x7214
eth1: 00:03:7f:09:0b:ad
athrs26_reg_init_lan
ATHRS26: resetting s26
ATHRS26: s26 reset done
ag7240_phy_setup 
eth1 up
eth0, eth1
Autobooting in 1 seconds
## Booting image at 9f020000 ...
   Uncompressing Kernel Image ... Too big uncompressed streamLZMA ERROR 1 - must RESET 

U-Boot 1.1.4 (Sep 14 2011 - 16:30:24)

AP121-2MB (ar9330) U-boot

DRAM:  32 MB
led turning on for 1s...

(Last edited by francx on 24 Jun 2012, 14:58)

It doesnt even start the kernel, flashed a wrong image?

You already have a serial connection which is the biggest hurdle for many, so just use it to flash a new image via tftp (its described on the wiki page of your router).

This?
http://wiki.openwrt.org/toh/tp-link/tl- … boot.rs232

Yes, exactly.

I can not setup ipaddr and serverip because my router are rebooting over and over

Write

to stop autoboot and get uboot prompt.

Thank you very much!

This happened to me few times!
I think it was because the openwrt OS was stuck or in a strange status, after doing sysupgrade it didn't reboot and stayed without network connectivity forever. After 15 minutes I said, hey! go on! and disconnected the router. Then it happened that, corrupted firmware. So I had to recover using the bootloader
Now I always save my config files first, then do "mtd -r erase rootfs_data" to delete everything, returning to factory settings.
After it reboots, I do the upgrade. No problems since then.

hello
I have the same problem, can describe the procedure step by step, please, I'm new in these things.

thank you very much
greetings

I got, my router works fine, Here is my tuturial

TUTURIAL TFTPBOOT + RS232 PARA TP-LINK 741ND V2

1-MATERIAL NECESSÁRIO

CABO NOKIA CA-42 OU DKU-5 EU USEI O SEGUNDO COMPREI NOS CHINESES 5€

2-SOLDAR A PLACA NOS PONTOS REFERIDOS NA IMAGEM ABAIXO(EU SOLDEI NA PARTE DE TRÁS).

http://wiki.openwrt.org/_detail/toh/tp- … tl-wr741nd

VERIFICAR O PINOUT DO CABO CONFORME IMAGEM ABAIXO

http://www.google.pt/imgres?imgurl=http … mp;dur=535

3-EU UTILIZEI O SISTEMA LINUX UBUNTU, INSTALEI O SERVIDOR TFTP-HPA E CONFIGURAR O FICHEIRO TFTP-HPA.

# /etc/default/tftpd-hpa

TFTP_USERNAME="tftp"
TFTP_DIRECTORY="/home/ropafiro/tftpboot"
#TEM QUE CRIAR ESTA PASTA NA VOSSA HOME E COPIAR PARA LÁ O FICHEIRO BIN DO FIRMWARE DO ROUTER
TFTP_ADDRESS="192.168.1.68:69"
#ESTE IP É O DO VOSSO COMPUTADOR
TFTP_OPTIONS="—secure"

4-USEI O CUTECOM PARA CONECTAR AO ROUTER COM O RESPECTIVO CABO DKU-5

PENSO QUE BASTA ALTERAR O DEVICE PARA /dev/ttyUSB0

LIGAR O ROUTER A REDE NA PORTA WAN

5-PARA PARAR O REINICIAR DO ROUTER, ASSIM QUE APARECER A MENSAGEM

Autobooting in 1 seconds INPUT tpl

INPUT setenv serverip 192.168.1.68 ESTE IP É O DO VOSSO COMPUTADOR

PARA TER  A CERTEZA DO ENDEREÇO (0x81000000) MEMORIA ACONSELHO A EXECUTAR O COMANDO loady

INPUT tftpboot 0x81000000 tplink.bin ESTE BIN É O FIRMWARE ORIGINAL DO ROUTER CONVEM ALTERAR O NOME PARA TPLINK
NO FINAL DO FLASH APRESENTA UMA MENSAGEM COMO ESTA:
Bytes transferred = 3932160 (3c0000 hex)

O PRÓXIMO INPUT erase 0x9f020000 +3c0000 REPAREM QUE O SEGUNDO ENDEREÇO E O QUE A MENSAGEM TEM.
DEPOIS DE EXECUTADO O ERASE DÁ UMA MENSAGEM:
Erased 60 sectors

INPUT cp.b 0x81000000 0x9f020000 0x3c0000

E FINALMENTE INICIAMOS O ROUTER INPUT bootm 9f020000

SE TUDO ESTIVER BEM PODE ACEDER AO ROUTER NO BROWSER 192.168.1.1
USER:admin
PASSWORD:admin

AGRADEÇO A TODOS OS TUTORIAIS QUE ENCONTREI NA INTERNET

http://www.google.pt/imgres?imgurl=http … mp;dur=535

http://www.google.pt/imgres?imgurl=http … mp;dur=535

http://www.youtube.com/watch?v=713hvVp_hFw

http://wiki.openwrt.org/toh/tp-link/tl-wr741nd

ftp://dd-wrt.com/others/eko/BrainSlayer … wr741ndv1/

http://www.dd-wrt.com/phpBB2/viewtopic.php?p=671793

http://puffs.wordpress.com/2008/02/14/i … em-ubuntu/

BOA SORTE

(Last edited by ropafiro on 26 May 2013, 15:17)

Hello I have the same problem with my Tp -Link MR 3020
During the screen the "tpl" password doesn't work, i don't know how to fix it ?

Thank You

Auto-Response :

27/07/2015 SOLVED since 2014 : It was a hardware problem, u-boot console working well with tpl, i could flash a new .bin image by tftp protocole, for any question send a message !

(Last edited by sayatnowa on 27 Jul 2015, 13:49)

sayatnowa, please start a new thead. And give all console output
And what you did to get where you are.

Since I have a similar problem I´d rather not open a topic but post it here. Hopefully I get responses quick because I need to set up the device by tomorrow!

Got a bricked 741ND v2.4

Got rs232 connected. Now Im rather certain I got RX/TX/GND right because I use the same cable to unlock netgear devices.

When I open the session in putty nothing happens when I power on the 741nd. When its off I can type and see my inputs.

When I disconnect the RX wire and only TX and GND are attached I get the following output:

But obviously since RX isnt connected I cant type tpl to interrupt reboot. Baud is 115200 8/1/N/N played around with different settings but same result.

Hopefully someone has an idea. Thanks for any help!

check for shortcuts, you say you can "see your inputs"? you mean u got echo in terminal? that is not ok.

Yes when the 741nd is powered off I can type into the console. When I power it on, nothing happens. Not even output, only when detaching RX then I get what I posted above. It´s weird. Check for shortcuts on the 741?

lol i mean short-circuits.. with a multimeter, check resistance (ohm ) between tx and rx.

Not sure if I did this correctly because Im not that into electronics. But when its turned off I get a read of 1350 and when on its about 850. Dont know what that means?!?!?!? :D

Edit: when I set the MM to 20M then I get a reading of 8.4 when the 741 is off and power unplugged, when off and power plugged in its 6.3 and when its powered on nothing happens.

Edit 2: Well now I unplugged RX and could spam tpl BLINDLY and it actually stops the reboot. LAN lights up. Now I have the problem that since I cant read, I dont now if printenv setenv etc does anything. If yes it wouldnt talk to my tftp server so I dont know if the memory adress I use 0x81000000 is actually correct for the tftpboot 0x............ firmware.bin command is accurate.

Normally I wouldnt care for a 15€ device but I have heavy OCD in those regards and really would love to solve this.

(Last edited by geyza0711 on 4 Mar 2014, 19:16)