Cisco MR18 stop working


I flashed a Cisco MR18 1 or 2 years ago.

It worked well until it didn't works.

I'm trying to connect the serial on it to check if it loose his firmware.

I connected the seria port and boot it up but nothing appear on the console, i tryed speed 9600, 115200 & 57600.
i inversed the tx and rx , i disconnected the 5V to use the power supply, but only the red led stay on .

Is it a way to recover it ?


you require a working serial console refer to the recently updated jtag recovery method on the wiki

I tested that procedure but i cant get anything in the console.
I inversed TX and RX for testing.

Here is what i get when i launch openocd:

sudo openocd -f raspberrypi-native.cfg -f mr18.cfg -c "init; halt"

Open On-Chip Debugger 0.10.0
Licensed under GNU GPL v2
For bug reports, read
BCM2835 GPIO config: tck = 11, tms = 25, tdi = 10, tdo = 9
BCM2835 GPIO config: trst = 7
Info : auto-selecting first available session transport "jtag". To override use 'transport select <transport>'.
Warn : Transport "jtag" was already selected
adapter speed: 1000 kHz
Info : BCM2835 GPIO JTAG/SWD bitbang driver
Info : JTAG only mode enabled (specify swclk and swdio gpio to add SWD mode)
Info : clock speed 1006 kHz
Error: JTAG scan chain interrogation failed: all zeroes
Error: Check JTAG interface, timings, target power, etc.
Error: Trying to use configured scan chain anyway...
Error: ar9344.cpu: IR capture error; saw 0x00 not 0x01
Warn : Bypassing JTAG setup events due to errors
Error: Failed to enter Debug Mode!
Info : Halt timed out, wake up GDB.
Error: timed out while waiting for target halted

Looks like it's totallly dead :confused:
Only the withe and red led show up when i connect the power cable

you need to issue the openocd command immediately as the device is powered on.

but without a serial console im not sure your device is even trying to start