Quectel RM500Q failing to get ip address assignment with netifd and modemmanager

[Reinhard Speyerer]

On Mon, May 11, 2020 at 06:56:53PM -0500, Alex Ballmer wrote:
> Hi there,
> 
> I am trying to get a quectel RM500Q modem working using modemmanager
> 1.12.10 on openwrt 18.06.2. Since the device I am on uses a 4.14
> kernel, I manually backported the following changes from linux upstream
> to allow the qmi_wwan driver to recognize the modem
> 
> I am connecting using verizon wireless with default APNs
> 
> https://github.com/torvalds/linux/commit/a9ff44f0e61d074f29770413fef6a5452be7b83e
> https://github.com/torvalds/linux/commit/f3eaabbfd093c93d791eb930cc68d9b15246a65e
> https://github.com/torvalds/linux/commit/accf227de4d211b52c830a58b2df00d5739f2389
> 

Hi Alex (and other RG500Q/RM500Q users performing firmware updates),

since I did not have firmware files when I submitted the RM500Q QDL mode
patch I could only verify that the device switched to Sahara mode and one
could reset it to normal mode. What I learned from doing a firmware update
later is that Quectel firmware tools switch the device to another mode
("emergency download mode") with Qualcomm USB id 05c6:9008.

Unless you need Sahara memory dumps on OpenWrt you could leave it out to
simplify backporting.

>            | firmware revision: RM500QGLAAR01A01M4G_BETA_20200316F  1
> [Mar 13 2020 07:00:00]

BTW, there is now also a RM500Q R05 firmware available which is required
e.g. to use 5G networks in standalone mode.

Regards,
Reinhard