[Solved] Buffalo AirStation WZR-D1800H 1750 + Black Flash USB+

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[Solved] Buffalo AirStation WZR-D1800H 1750 + Black Flash USB+

mtruchado

Hi
I'm new in this world with flashers and so on. I have here a bricked Buffalo AirStation WZR-D1800H 1750 and I would like to connect to it via my Black Flash USB+, At the end what I would like to do is to upload the original firmware to make It working again
For this, I installed following the tutorial the Black Flash USB+ drivers, Everything is recognised, everything works... so now I have putty and I want to open a terminal to the router to see what's going on there.
Here:
https://codechief.files.wordpress.com/2013/06/jumper.jpg
There is a picture of the connector that I have, a serial 4-pin with 3,3V
How should I proceed with the Black Flash USB+ ? I Tried to connect It to the 3V3, GND, RXD, TXD pins, but if I try to connect to it I get no response so I thing that the wiring must be wrong. do I'm missing anything? could please anyone help me with the wiring or even better point me to a place where I can learnt how to do It?
Thanks in advance

mtruchado

I got an update on this one
I managed to solve myself, not in the way that I expected but at least now I know more than before
First of all, you have a 4-Pin usb-serial connector, how to know which is which?, do you have a multimeter?, then In a couple of minutes you have the answer
The easy step is to look for the GND. Find a short between one of the four pins and the ground layer of the pcb. Once GND is identified It is time to switch on your router. Set your multimeter to 20V DC. 2 of the rest of the pins will give you probably 3.3V, It could be also that you get 5V, this is the Voltage that you have to keep in mind to set your Flash CAT (there is a switch 3.3/5V). RX is the one that didn't give you any output, this is, 0V, the ones that give you a voltage are VCC and TX. So, which is which from VCC and TX? VCC is connected to the supply layer, so check which of the two have this property.
Now you are ready to connect to the Flash Cat in this way:
VCC <-> 3V3 (99%) or 5V, depends on what you read in the previous step
GND <-> GND
RX <-> TX
TX <-> RX
Yes, It is not a mistake, RX and TX go to the opposite in the board.
What's next? open your favourite terminal, select the right COM port and try to find which baud rate is the one that your router uses to communicate with. Try and error is the only way to do it. For me 38400 was the right value.
I hope I could help anyone.

[deleted]

thanks for the feedback. closing as solved