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

[Philip Prindeville]

Didn't notice these before:

Sun Mar 15 15:49:20 2026 daemon.notice netifd: qmi (7922): SIM in illegal state - Power-cycling SIM



> On Mar 15, 2026, at 3:37 PM, Philip Prindeville <philipp_subx at redfish-solutions.com> wrote:
> 
> Seeing:
> 
> root at OpenWrt:~# uqmi -d /dev/cdc-wdm0  --network-register --apn fast.t-mobile.com
> "UIM uninitialized"
> root at OpenWrt:~# 
> root at OpenWrt:~# uqmi -d /dev/cdc-wdm0  --get-signal-info
> {
>        "type": "lte",
>        "rssi": -71,
>        "rsrq": -9,
>        "rsrp": -102,
>        "snr": 15.200000
> }
> root at OpenWrt:~# 
> root at OpenWrt:~# uqmi -d /dev/cdc-wdm0  --get-system-info
> {
>        "wcdma": {
>                "service_status": "none",
>                "true_service_status": "none",
>                "preferred_data_path": false
>        },
>        "lte": {
>                "service_status": "limited",
>                "true_service_status": "none",
>                "preferred_data_path": false,
>                "domain": "none",
>                "service": "cs-ps",
>                "roaming_status": "on",
>                "forbidden": false,
>                "mcc": "310",
>                "mnc": "410",
>                "tracking_area_code": 38656,
>                "enodeb_id": 431085,
>                "cell_id": 17,
>                "cell_access_status": "all calls",
>                "registration_restriction": 0,
>                "registration_domain": 0,
>                "5g_nsa_available": false,
>                "dcnr_restriction": false
>        },
>        "5gnr": {
>                "service_status": "none",
>                "true_service_status": "none",
>                "preferred_data_path": false
>        }
> }
> root at OpenWrt:~# 
> root at OpenWrt:~# uqmi -d /dev/cdc-wdm0  --list-messages
> "Device not ready"
> root at OpenWrt:~#
> root at OpenWrt:~# uqmi -d /dev/cdc-wdm0  --set-network-modes 5gnr
> root at OpenWrt:~# uqmi -d /dev/cdc-wdm0  --get-signal-info
> {
>        "type": "5gnr",
>        "rsrp": -102,
>        "snr": 15.000000,
>        "rsrq": -11
> }
> root at OpenWrt:~# 
> root at OpenWrt:~# uqmi -d /dev/cdc-wdm0   --uim-get-sim-state
> {
> 
> }
> root at OpenWrt:~# 
> root at OpenWrt:~# uqmi -d /dev/cdc-wdm0   --network-scan
> {
>        "network_info": [
>                {
>                        "mcc": 311,
>                        "mnc": 480,
>                        "description": "Verizon",
>                        "status": [
>                                "available",
>                                "roaming",
>                                "not_forbidden",
>                                "not_preferred"
>                        ]
>                },
>                {
>                        "mcc": 313,
>                        "mnc": 100,
>                        "description": "FirstNet",
>                        "status": [
>                                "available",
>                                "roaming",
>                                "not_forbidden",
>                                "not_preferred"
>                        ]
>                },
>                {
>                        "mcc": 310,
>                        "mnc": 260,
>                        "description": "T-Mobile",
>                        "status": [
>                                "available",
>                                "roaming",
>                                "not_forbidden",
>                                "not_preferred"
>                        ]
>                },
>                {
>                        "mcc": 310,
>                        "mnc": 410,
>                        "description": "AT&T",
>                        "status": [
>                                "available",
>                                "roaming",
>                                "not_forbidden",
>                                "not_preferred"
>                        ]
>                }
>        ],
>        "radio_access_technology": [
>                {
>                        "mcc": 311,
>                        "mnc": 480,
>                        "radio": "lte"
>                },
>                {
>                        "mcc": 313,
>                        "mnc": 100,
>                        "radio": "lte"
>                },
>                {
>                        "mcc": 310,
>                        "mnc": 260,
>                        "radio": "lte"
>                },
>                {
>                        "mcc": 310,
>                        "mnc": 410,
>                        "radio": "lte"
>                }
>        ]
> }
> root at OpenWrt:~# 
> root at OpenWrt:~# uqmi -d /dev/cdc-wdm0   --get-cell-location-info 
> {
>        "nr5g_cell_information": {
>                "enodeb_id": 29957745,
>                "cell_id": 56,
>                "physical_cell_id": 133,
>                "rsrq": -11.000000,
>                "rsrp": -104.000000,
>                "snr": 12.500000
>        },
>        "nr5g_arfcn": {
>                "arfcn": 521310
>        }
> }
> root at OpenWrt:~#
> root at OpenWrt:~# uqmi -d /dev/cdc-wdm0   --get-tx-rx-info 5gnr
> "Not supported"
> root at OpenWrt:~# uqmi -d /dev/cdc-wdm0  --get-serving-system
> {
>        "registration": "not_registered",
>        "radio_interface": [
>                "5gnr"
>        ],
>        "plmn_mcc": 310,
>        "plmn_mnc": 260,
>        "plmn_description": "",
>        "roaming": true
> }
> root at OpenWrt:~# 
> root at OpenWrt:~# uqmi -d /dev/cdc-wdm0  --get-device-operating-mode
> "online"
> root at OpenWrt:~# 
> root at OpenWrt:~# uqmi -d /dev/cdc-wdm0  --uim-get-sim-state
> {
> 
> }
> root at OpenWrt:~#
> root at OpenWrt:~# uqmi -d /dev/cdc-wdm0  --get-pin-status
> "Not supported"
> root at OpenWrt:~# uqmi -d /dev/cdc-wdm0  --get-current-settings
> "Out of call"
> root at OpenWrt:~# uqmi -d /dev/cdc-wdm0  --get-capabilities
> {
>        "max_tx_channel_rate": 0,
>        "max_rx_channel_rate": 0,
>        "data_service": "non_simultaneous_cs_ps",
>        "sim": "supported",
>        "networks": [
>                "umts",
>                "lte",
>                "5gnr"
>        ]
> }
> root at OpenWrt:~# 
> root at OpenWrt:~# uqmi -d /dev/cdc-wdm0  --get-device-operating-mode
> "online"
> root at OpenWrt:~#
> root at OpenWrt:~# uqmi -d /dev/cdc-wdm0  --get-data-status
> "disconnected"
> root at OpenWrt:~# 
> 
> 
> 
> root at OpenWrt:~# cat /etc/config/network
> ...
> config interface 'qmi'
>        option proto 'qmi'
>        option device '/dev/cdc-wdm0'
>        option apn 'fast.t-mobile.com'
>        option auth 'none'
>        option pdptype 'ipv4v6'
>        ##option apntype 'default,supl'
> ##option apntype 'internet+mms'
>        ##option plmn '310260'
>        option modes '5gnr,lte'
>        option dhcp '1'
>        option autoconnect '1'
> ...