Last year, I was trying to help a friend change his router's firmware (Belkin Share N300 Wireless N+ Router MiMo 3D & USB Port) to DD-WRT, he tried first and something didn't work like it should and asked me for help, because I've been succesful to make DD-WRT work in other 2 routers (WRT54GL & F7D7301).
After a couple hours I suggested my friend we used tomato firmware instead of DD-WRT becuase tomato has a friendlier interface.
He accepted and I flashed tomato, I swear I selected to "Reset to default settings"
The problem was that the router stopped working, I have just made a beautiful plastic brick :(
Tried several times the 30/30/30 reset and it didn't work. We finally gave up on the router and decided to work on it later.
Gettin' Jiggy wit It
Well, until the past weekend I had the oportunity to look further into this issue, thanks to Scott Gibson I was able to confirm the router's serial port:
Pin 1: Vcc (3.3V)
Pin 2: RX
Pin 3: TX
Pin 4: Gnd
Setup the Pi
First, You have to comment the following line in
T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100
it should look like this:
#T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100
Reboot the RPi and now we can use the serial port.
How to connect the RPi
Thanks to lavalink for the image
Now we connect these ports to the router (Router should be off)
RPi - Router
GND <-> GND
TX <-> RX
RX <-> TX
Listen to the serial
Install minicom in the RPi
sudo apt-get install minicom
Then run minicom on the serial port of the RPi
sudo minicom -b 115200 -o -D /dev/ttyAMA0
Now power on the router while holding
C and now the terminal should capture whatever is going in the router, sorry for not providing better looking images.
In this case, the router was stuck verifying something and since it was wrong it rebooted every time it got to that point, the good thing is that now I knew the bootloader was OK and I didn't need to use jtag.
I pressed the
space bar to stop the verification and finally got to the CFE prompt.
Cleared nvram and reboot
CFE> nvram erase
I finally saw the device assigning and IP address to port, I connected a computer to Port 1 and openned 192.168.1.1
TOMATO was up and running, for some reason the hard reset was not doing its thing.
Now F7D7302 is working again :)
P.S. This is how the mess looked like
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