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Topic: wr740n v2.1 boot damaged

The content of this topic has been archived on 6 Apr 2018. There are no obvious gaps in this topic, but there may still be some posts missing at the end.

Hi everyone ;

more people have router ver4x and they can unbricked own router but mine is ver2.1, i tried all of implementation but mine is not respond others.

- when connect putty with serial (usb-ttl), can see the led behaviour and putty screen.
     https://youtu.be/-aJlytrxvvo

- i tried all of variation not respond reset or qss button, if have a any trick ?
  http://i.hizliresim.com/QZQYjG.jpg

- when try static ip (xx.0.66 - xx.1.66) neither LAN nor WAN port not connect, can't start TFTP32 server.

can see below putty screen

*****************
U-Boot 1.1.4 (Sep  3 2010 - 12:28:13)

AP91 (ar7240) U-boot
DRAM:
sri
#### TAP VALUE 1 = 9, 2 = 9
32 MB
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
: cfg1 0xf cfg2 0x7014
eth0: 00:03:7f:09:0b:ad
eth0 up
No valid address in Flash. Using fixed address
: cfg1 0xf cfg2 0x7214
eth1: 00:03:7f:09:0b:ad
ATHRS26: resetting s26
ATHRS26: s26 reset done
eth1 up
eth0, eth1
Autobooting in 1 seconds
## Booting image at 9f020000 ...
   Uncompressing Kernel Image ... Error: Bad gzipped data
GUNZIP ERROR - must RESET board to recover

Resetting...

(then loop to top again again, not stopped)
********************************

do you have any idea and solution or comment ? what will i do ?

I have a similar one, but 841n v8.4 that really has its U-boot dead(I wrote the firmware to u-boot partition accidentally from dd-wrt). No leds blink at all, the lan and power leds stay on. No output on serial console at all. So yours doesn't actually have broken u-boot.
Type "tpl" (no quotes) quickly when you see this
Autobooting in 1 seconds

Then you get to the Uboot console. Follow the instructions on the page of your device:
https://wiki.openwrt.org/toh/tp-link/tl-wr740n

finally was sucessful :-)

special thanks to "user5077" for; give to me some tricks.

it is confused section of "TFTP" connection cli-server ip and "putty" command.

i want explain for newbee users easyest make.

- out of order wireless
- TCP/iP computer side static ip
  ip = 192.168.1.2
  mask= 255.255.255.0
  gateway= 192.168.1.1
- Putty side configure ip
  setenv ipaddr 192.168.1.1
  setenv serverip 192.168.1.2
  and check "printenv" command
- tftpd32 configure and firmware path...
  implament the directive of link
  https://wiki.openwrt.org/toh/tp-link/tl-wr740n
  UART on v4.23 section
  *** please be aware download and install appropriate version of openwrt.

and thanks again to "user5077"

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