怎么去解决ROC-RK3568-PC SE EC20板无法上网的问题呢？

问题描述及复现步骤:

General  |              path: /org/freedesktop/ModemManager1/Modem/0

| device id: 148b7e11716fd6b8d507b9d5322af03defac5a7b

Hardware |      manufacturer: Quectel

| model: EC20F
| firmware revision: EC20CEHCLGR06A05M1G
| supported: gsm-umts, lte
| current: gsm-umts, lte
| equipment id: 868274063130910

System   |            device: /sys/devices/platform/fd880000.usb/usb2/2-1

| drivers: qmi_wwan_q, option
| plugin: quectel
| primary port: ttyUSB2
| ports: ttyUSB0 (qcdm), ttyUSB1 (gps), ttyUSB2 (at), ttyUSB3 (at),
| wwan0 (net)

Status   |             state: failed

| failed reason: sim-missing
| power state: on
| signal quality: 0% (cached)

Modes    |         supported: allowed: 2g, 3g, 4g; preferred: none

| current: allowed: any; preferred: none

IP       |         supported: ipv4, ipv6, ipv4v6

板卡连接正常，用的电信卡，也正常。