--- sys/dev/usb/usbdevs.orig	2020-09-17 04:32:13.647475000 +0000
+++ sys/dev/usb/usbdevs	2020-09-17 04:33:34.553129000 +0000
@@ -4847,6 +4847,7 @@
 product WIENERPLEINBAUS CML	0x0015	CML Data Logger
 
 /* Windbond Electronics */
+product WINBOND CDC		0x5011	CDC serial device
 product WINBOND UH104		0x5518	4-port USB Hub
 
 /* WinMaxGroup products */
--- sys/dev/usb/serial/umodem.c.orig	2020-09-17 04:32:04.170791000 +0000
+++ sys/dev/usb/serial/umodem.c	2020-09-17 04:37:35.461972000 +0000
@@ -150,6 +150,8 @@
 	{USB_VPI(USB_VENDOR_KYOCERA, USB_PRODUCT_KYOCERA_AHK3001V, 1)},
 	{USB_VPI(USB_VENDOR_SIERRA, USB_PRODUCT_SIERRA_MC5720, 1)},
 	{USB_VPI(USB_VENDOR_CURITEL, USB_PRODUCT_CURITEL_PC5740, 1)},
+	/* Winbond */
+	{USB_VENDOR(USB_VENDOR_WINBOND), USB_PRODUCT(USB_PRODUCT_WINBOND_CDC)},
 };
 
 /*