Rutx12 secondary modem unreachable - try firmware reset?

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

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,

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

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.

this does not seem right

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

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?