[Quectel EM160R-GL] Various commands over mbim fail with 'Invalid transition'

[Alex Ballmer]

> On Jun 13, 2023, at 6:04 AM, Aleksander Morgado <aleksandermj at chromium.org> wrote:
> 
> On Tue, Jun 13, 2023 at 1:43 AM Alex Ballmer <alexb at meshplusplus.com> wrote:
>> 
>> After upgrading an EM160R-GL modem via QFireHose from firmware version EM160RGLAUR02A07M4G to version EM160RGLAUR02A07M4G, almost all functions fail with ‘Invalid transition’. The modem power state is listed as "power state: low” via mmcli. On the former firmware version everything was working fine.
>> 
>> This is currently happening with modemmanager 1.18.8 using mbim via the qmi_wwan driver on openwrt with linux 4.4.60 and libmbim 1.28.4
>> 
>> I tried manually enabling it (in case it was FCC locked) via  mbimcli --device-open-proxy --device="/dev/cdc-wdm0" --quectel-set-radio-state=on, but this also had no effect.
>> 
>> What additional steps would I need to take to debug this?
> 
> Very likely that they may have changed the FCC unlock algorithm in the
> newer firmware version :/
> 
> -- 
> Aleksander


The same firmware version has worked on other modems of the same model. This appears to be a problem with a specific batch of modems(?). Is this something that is likely to occur?

Also in my testing the modem is not FCC locked, its stuck in factory-test mode, as verified by AT+QRFTESTMODE?. Attempting to leave factory-test mode with AT+QRFTESTMODE=0 doesn’t seem to have any effect