Latest firmware + linux tools for rg255

IoT Modules 5G Module
1

Hello, I have this firmware:

at+qgmr
RG255CGLABR01A04M4G_A0.300.A0.300

I am running linux kernel:

uname -a
Linux exeltel 6.16.7+deb14-rt-amd64 #1 SMP PREEMPT_RT Debian 6.16.7-1 (2025-09-11) x86_64 GNU/Linux

I can’t use minicom + quectel-CM to control the rg255. minicom works with the “option” kernel module, so I can have AT commands, but then there is no network interface created. If I remove “option” and use only “qmi_wwan” then quectel-CM fails with those repeated logs:

[01-20_12:33:03:795] QmiWwanThread poll err/hup/inval
[01-20_12:33:03:795] poll fd = 7, events = 0x0008
[01-20_12:33:03:795] QmiWwanThread poll err/hup/inval
[01-20_12:33:03:795] poll fd = 7, events = 0x0008
[01-20_12:33:03:795] QmiWwanThread poll err/hup/inval

I would like to have a more recent firmware, if any.

Also, a version of qmi_wwan_q than can compile for my kernel version (I have 1.2.7, which fails to compile).

And finally, a version of QConnectManager that would work for my setup. I have 1.6.7.

If anything else is needed for a proper usage of the rg255 on my setup, please provide it as well, thank you.

Thank you by advance, and I can provide more information if needed.

2

Dear @CedricEurecom
I have newer version to you, please try.
Please note QconnectManager can’t work together with modem manager, please uninstall modem manager when use QconnectManager .

3

Thank you.
Yes, ModemManager does not run on my setup.
The kernel module does not compile, but I can use the rg255 with option/qmi_wwan.
Thank you again for your support.