Frage zu Quectel RM500U-CNV

[Dan Williams]

On Tue, 2025-03-18 at 17:49 +0100, Uwe at Moosheimer.com wrote:
> Dear Community,
> I'm not sure if this is the right place to ask my question. If this
> is
> not the case, then I apologize and ask for a hint where I can ask it.
> 
> I am using the Banana R4 with OpenWRT 24.10.0 r28427-6df0e3d02a /
> LuCI
> openwrt-24.10 branch 25.076.76243~9c000ff.
> 
> Two weeks ago I bought and installed the Quectel RM500U-CNV.
> Everything
> worked fine and the modem is recognized and addressed via MBIM.
> But unfortunately the ModemManager always says:
> 
> 'Cannot change modes: only one combination supported'
> 
> In the last few days I have read several times that the Quectel
> RM500U-CNV is probably not supported by ModemManager.
> Is this correct?

I would expect the device's MBIM mode to work with ModemManager. ECM
mode won't currently work (though there is a branch under review for
that).

Would you be able to run ModemManager with the "--debug" option and get
the log output of when you experience the problem? That would help
figuring out what the issue is.

Thanks,
Dan

> And if so, will this change in the foreseeable future?
> And if not, can anyone give me a beginner's hint on how to get the
> modem
> to work or whether I need to buy another one?
> 
> - Uwe
> 
> 
> 
>