Rutx12 secondary modem unreachable - try firmware reset?

NETWORKING SOLUTIONS
1

hello, “secondary modem unreachable”.

I have tried up and downgrading the firmware, I have reflashed in bootloader mode, factory reset several times.

the first modem has version

ati

Quectel
EG06
Revision: EG06ELAR04A20M4G

however, the second modem does not respond to ati commands and periodically disconnects from usb:

[  860.155918] option 1-1.2:1.3: device disconnected
[  873.724057] usb 1-1.2: new high-speed USB device number 31 using xhci-hcd
[  874.001466] option 1-1.2:1.0: GSM modem (1-port) converter detected
[  874.001775] usb 1-1.2: GSM modem (1-port) converter now attached to ttyUSB4
[  874.007640] option 1-1.2:1.1: GSM modem (1-port) converter detected
[  874.014038] usb 1-1.2: GSM modem (1-port) converter now attached to ttyUSB5
[  874.020514] option 1-1.2:1.2: GSM modem (1-port) converter detected
[  874.027246] usb 1-1.2: GSM modem (1-port) converter now attached to ttyUSB6
[  874.034067] option 1-1.2:1.3: GSM modem (1-port) converter detected
[  874.040309] usb 1-1.2: GSM modem (1-port) converter now attached to ttyUSB7
[  896.465354] usb 1-1.2: USB disconnect, device number 31
[  896.465891] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[  896.469602] option 1-1.2:1.0: device disconnected
[  896.478383] option1 ttyUSB5: GSM modem (1-port) converter now disconnected from ttyUSB5
[  896.482493] option 1-1.2:1.1: device disconnected
[  896.492321] option1 ttyUSB6: GSM modem (1-port) converter now disconnected from ttyUSB6
[  896.495555] option 1-1.2:1.2: device disconnected
[  896.503534] option1 ttyUSB7: GSM modem (1-port) converter now disconnected from ttyUSB7
[  896.508117] option 1-1.2:1.3: device disconnected

would it make sense to try flashing with qfirehose? Which pins should I short for resetting?

The device is 3.5 years old, so probably no guaranteed RMA

3

Hello,

Could you please connect to the router’s CLI (System → Maintenance → CLI, login: root) and provide the output of the following command:

lsusb

Best Regards,

4

Is that it?

root@RUTX12:~# lsusb
Bus 003 Device 001: ID 1d6b:0002
Bus 001 Device 001: ID 1d6b:0002
Bus 001 Device 002: ID 05e3:0610
Bus 004 Device 001: ID 1d6b:0003
Bus 002 Device 001: ID 1d6b:0003
Bus 001 Device 003: ID 0a12:0001
Bus 001 Device 005: ID 2c7c:0306
Bus 003 Device 002: ID 2c7c:0306
5

Could you please try executing the following command and see if it helps resolve the issue:

mctl -r -m modem2

If this doesn’t resolve the problem, I’ve sent you a form to fill out. For the ticket ID, please use “10747.” Once the form is submitted, we will contact you privately to continue troubleshooting and further investigate the issue.

6

this does not seem right

root@RUTX12:~# ubus list | grep gsm.modem
gsm.modem0
# mctl -r -m modem2
OK
7

how can I disable modem0 so as to see only the second?
mctl -s -n 0 does not work, someone seems to be trying to put it back on after a few seconds?