Index: if_umb.c
===================================================================
RCS file: /cvs/src/sys/dev/usb/if_umb.c,v
retrieving revision 1.49
diff -u -p -w -r1.49 if_umb.c
--- if_umb.c	11 Jan 2022 10:34:13 -0000	1.49
+++ if_umb.c	31 Mar 2023 01:40:43 -0000
@@ -237,12 +237,13 @@ const struct umb_quirk umb_quirks[] = {
 	  2,
 	  UMATCH_VENDOR_PRODUCT
 	},
-
+#if 0
 	{ { USB_VENDOR_QUECTEL, USB_PRODUCT_QUECTEL_EC25 },
 	  0,
 	  1,
 	  UMATCH_VENDOR_PRODUCT
 	},
+#endif
 
 
 	{ { USB_VENDOR_HUAWEI, USB_PRODUCT_HUAWEI_ME906S },
Index: umsm.c
===================================================================
RCS file: /cvs/src/sys/dev/usb/umsm.c,v
retrieving revision 1.122
diff -u -p -w -r1.122 umsm.c
--- umsm.c	23 Aug 2022 08:12:30 -0000	1.122
+++ umsm.c	31 Mar 2023 01:40:43 -0000
@@ -293,19 +293,24 @@ int
 umsm_match(struct device *parent, void *match, void *aux)
 {
 	struct usb_attach_arg *uaa = aux;
+	const struct umsm_type *umsmt;
 	usb_interface_descriptor_t *id;
 	uint16_t flag;
 
 	if (uaa->iface == NULL)
 		return UMATCH_NONE;
 
+	umsmt = umsm_lookup(uaa->vendor, uaa->product);
+	if (umsmt == NULL)
+		return UMATCH_NONE;
+
 	/*
 	 * Some devices (eg Huawei E220) have multiple interfaces and some
 	 * of them are of class umass. Don't claim ownership in such case.
 	 */
-	if (umsm_lookup(uaa->vendor, uaa->product) != NULL) {
+
 		id = usbd_get_interface_descriptor(uaa->iface);
-		flag = umsm_lookup(uaa->vendor, uaa->product)->umsm_flag;
+	flag = umsmt->umsm_flag;
 
 		if (id == NULL || id->bInterfaceClass == UICLASS_MASS) {
 			/*
@@ -335,11 +340,19 @@ umsm_match(struct device *parent, void *
 			     (id->bInterfaceSubClass == 0x00 &&
 			      id->bInterfaceProtocol == 0x00)))) {
 			return UMATCH_NONE;
-		} else
-			return UMATCH_VENDOR_IFACESUBCLASS;
-	}
 
+	/* See the Quectel LTE&5G Linux USB Driver User Guide */ 
+	} else if (uaa->vendor == USB_VENDOR_QUECTEL) {
+		/* Some interfaces can be used as network devices */
+		if (id->bInterfaceClass != UICLASS_VENDOR)
 	return UMATCH_NONE;
+
+		/* Interface 4 can be used as a network device */
+		if (uaa->ifaceno >= 4)
+			return UMATCH_NONE;
+	}
+
+	return UMATCH_VENDOR_IFACESUBCLASS;
 }
 
 void