Probles with a Sierra Wireless MC7430

Aleksander Morgado aleksander at
Sun Oct 15 08:30:32 UTC 2017

> We have several MC 7430 modems here but one modem is only appearing with on
> device. I mean all of them create 2 devices /dev/cdc-wdm0 and /dev/cdc-wdm1.
> If that is the case I can upgrade their firmware with qmi-firmware-upgrade.
> For the one board only 1 device is created /dev/cdc-wdm0 and I can not
> communicate with it. Everty qmi command times out with the following error
> qmicli -d /dev/cdc-wdm0 --dms-get-hardware-revision
> error: couldn't create client for the 'dms' service: CID allocation failed
> in the CTL client: Transaction timed out
> Does anyone has any experience with this kind of error or am I facing a
> hardware failure ?

Is that last one really in QMI mode? Maybe it's in MBIM mode instead.
Try to run "qmicli --device-open-mbim -d /dev/cdc-wdm0

(or check e.g. dmesg to see what driver is reported as binding that interface)


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