Good day to everyone,

I´ve got a problem with my TP-Link WDR4300:

I was trying to flash a precompiled trunk version and now the device is busy...

So i tried to recover it as it is written on the wiki with serial port and tftp - But i´m getting UBOOT only when i pin the RX cable to router´s serial port VCC and GND on TX (VCC as it is in wiki and TX as it is in wiki)

here are some pictures of my setup:

https://www.dropbox.com/sh/13zyp172bmr9cab/S4ig_xVND_

Putty is on 115200 8N1 and is giving me this: (with TX on VCC pin... ;-(  )
--------------------------------------------------------------

U-Boot 1.1.4 (Apr 25 2012 - 18:29:12)

U-boot DB120

DRAM:  128 MB
id read 0x100000ff
flash size 8MB, sector count = 128
Flash:  8 MB
Using default environment

In:    serial
Out:   serial
Err:   serial
Net:   ag934x_enet_initialize...
No valid address in Flash. Using fixed address
wasp  reset mask:c03300
WASP  ----> S17 PHY *
: cfg1 0x7 cfg2 0x7114
eth0: ba:be:fa:xx:xx:xx               <--- edited
athrs17_reg_init: complete
eth0 up
eth0
Autobooting in 1 seconds
## Booting image at 9f020000 ...
   Uncompressing Kernel Image ... ERROR: LzmaDecode.c, 543

Decoding error = 1
LZMA ERROR 1 - must RESET board to recover

----------------------------------------------------------------

So is anyone here who can help me to recover my WDR4300 - Why is my VCC on board my TX pin????

when i try to pin on my RX i can´t send any command to board without hiroglyphic echo....???

The pictures you show have an RS232 socket. This is something like 12V.
What you need is TTL at 3.3V. You may have blown something up.
I suspect all you are seeing in your setup is voltage (ie rubbish in a serial Term).

This is a profilic 2303HX Rev. A USB to serial converter. I have normal message output over putty - but with pin 2 from d-sub 9 female, 
on the vcc pin on Router´s - Mainboard

Uboot output as shown in my upper post...

Router Mainboard Rev. is exactly the same as shown in wiki...

Tx signal on Vcc is normally totally impossible...??? So what is going wrong with this....???

(Last edited by stinger2k on 17 Jan 2013, 15:51)

Cool, just to double check, when you connect Tx to Rx on the PCside socket, do you get a proper echo?
My next step would be a multimeter to see where Vcc and Gnd really are device side.

With bridge over my tx and rx cable echo is exactly the same i was typing in...

Multimeter is here...

(Last edited by stinger2k on 17 Jan 2013, 16:01)

How can i measure the rs232 on the board (VCC, RX, TX)??

(Last edited by stinger2k on 20 Jan 2013, 11:11)

measure gnd to each of the other pins in turn (with the router turned on - doesn't matter if it functions/boots or not). One should be at ca 3.3 all the time (Vcc), one will be near 0 always (Rx), and one will fluctuate (at least during boot) = Tx.

On which port on the multimeter schould i connect the red cable on the VΩmA port or the 10ADC port???

New pic in my dropbox folder - take a look (first one)...

i can measure 3,26V between the hole on the white side (first pic) and the first pin (the upper one on the pic)..

Also between the wohle with the + an the second pin (from up to down side)

(Last edited by stinger2k on 20 Jan 2013, 12:20)

Use the first port on the meter.
Can you measure pin 1 to pin 2, 1 to 3, 1 to 4, 2 to 3, 2 to 4 and 3 to 4. That will give a definitive answer.

ERROR: LzmaDecode.c, 543
this err how to solve!?