Setting up a Quectel RM520GL-N on a Banana Pi R4-Pro

[Philip Prindeville]

I'm seeing network carriers at least:

root at OpenWrt:~# uqmi -d /dev/cdc-wdm0  --network-scan
{
        "network_info": [
                {
                        "mcc": 313,
                        "mnc": 100,
                        "description": "FirstNet",
                        "status": [
                                "available",
                                "roaming",
                                "not_forbidden",
                                "not_preferred"
                        ]
                },
                {
                        "mcc": 311,
                        "mnc": 480,
                        "description": "Verizon",
                        "status": [
                                "available",
                                "roaming",
                                "not_forbidden",
                                "not_preferred"
                        ]
                },
                {
                        "mcc": 310,
                        "mnc": 410,
                        "description": "AT&T",
                        "status": [
                                "current_serving",
                                "roaming",
                                "not_forbidden",
                                "not_preferred"
                        ]
                },
                {
                        "mcc": 310,
                        "mnc": 260,
                        "description": "T-Mobile",
                        "status": [
                                "available",
                                "roaming",
                                "not_forbidden",
                                "not_preferred"
                        ]
                }
        ],
        "radio_access_technology": [
                {
                        "mcc": 313,
                        "mnc": 100,
                        "radio": "lte"
                },
                {
                        "mcc": 311,
                        "mnc": 480,
                        "radio": "lte"
                },
                {
                        "mcc": 310,
                        "mnc": 410,
                        "radio": "lte"
                },
                {
                        "mcc": 310,
                        "mnc": 260,
                        "radio": "lte"
                }
        ]
}
root at OpenWrt:~# 


Not sure why it's all LTE and not 5G UWB...

Probably need to put my modem into the correct mode.



> On Mar 15, 2026, at 1:58 PM, Philip Prindeville <philipp_subx at redfish-solutions.com> wrote:
> 
> Hi,
> 
> I brought up the default image burned into my BPi-R4 Pro (which seems to be missing a bunch of modules to support modemmanager, as well as modemmanager itself).  I installed these per:
> 
> https://openwrt.org/docs/guide-user/network/wan/wwan/modemmanager
> 
> But can't figure out how to populate the new 'interface' section in /etc/config/network per the instructions.  Like the 'device' specifically.  Or 'lowpower'.
> 
> Also that page doesn't mention anything about ECM modems.
> 
> I'm using T-Mobile 5G Home Internet in the US.
> 
> root at OpenWrt:~# lsusb
> Bus 001 Device 001: ID 1d6b:0002 Linux 6.6.93 xhci-hcd xHCI Host Controller
> Bus 001 Device 002: ID 1a86:8091  USB HUB
> Bus 002 Device 001: ID 1d6b:0003 Linux 6.6.93 xhci-hcd xHCI Host Controller
> Bus 003 Device 001: ID 1d6b:0002 Linux 6.6.93 xhci-hcd xHCI Host Controller
> Bus 003 Device 002: ID 2109:2822 VIA Labs, Inc.          USB2.0 Hub             
> Bus 004 Device 001: ID 1d6b:0003 Linux 6.6.93 xhci-hcd xHCI Host Controller
> Bus 004 Device 002: ID 2109:0822 VIA Labs, Inc.          USB3.1 Hub             
> Bus 004 Device 003: ID 2c7c:0801 Quectel RM520N-GL
> root at OpenWrt:~# lspci
> root at OpenWrt:~# 
> 
> Some of the documentation says to use the ECM mode drivers, as well.
> 
> Any help appreciated.  My current network connection is going away in a few days and I need to get this working.
> 
> Thanks
>