我看 RG500U-CN&RM500U-CN网卡拨号应用指导 手册中是有写 MBIM 模式切换的，请问是固件版本太低了嘛
版本：RM500UCNAAR02A04M2G_BETA0408
AT+QCFG=?
+QCFG: "usbnet",(1,3,5)
+QCFG: "nat",(0-2)
+QCFG: "usbcfg",(1-65535),(1-65535),(0,1),(0,1),(0,1),(0,1),(0,1),(0,1),(0,1)
+QCFG: "ims",(0,1)
+QCFG: "pcie/mode",(0,1)
+QCFG: "ethernet",(0,1)
+QCFG: "uartat",(0,1)
+QCFG: "usbid",(1-65535),(1-65535)
+QCFG: "multiusbnet",(1-4),(0-4)
+QCFG: "usbmac",(sipa_usb0,usb0,usb1,usb2,usb3)
+QCFG: "hostmac",(usb0,usb1,usb2,usb3),<mac>
+QCFG: "staticarp",(0,usb0,usb1,usb2,usb3),<mac>
+QCFG: "lanip",<gateway>,<netmask>,<lease_time>
+QCFG: "lanip_ex",<gateway>,<netmask>,<start_ip>,<end_ip>,<lease_time>
+QCFG: "loopback",(0-15)
+QCFG: "usage/apmem"
+QCFG: "usage/apfs"
+QCFG: "proxyarp",(0,1)
+QCFG: "5glan",(1-8),(0,1)
+QCFG: "vlan",(0,1)
+QCFG: "autoapn",(0,1)
+QCFG: "usbmode",(host,device)
+QCFG: "usbspeed",(11,20,30)
+QCFG: "rp_filter",(0-2)
+QCFG: "ipa",(0-2)
+QCFG: "netmask",(0,1)
+QCFG: "thermal/modem",(1,2),(0~110000)
+QCFG: "tts",(0,1)
+QCFG: "pm/powersave",(0,1)
+QCFG: "vonr",(0,1)
+QCFG: "pcie/direct",(0,1)
+QCFG: "pack",(0,1)
+QCFG: "mtu",(1-4),<mtu>
+QCFG: "eth_at",(0,1)