diff -ruN linux-2.6.25-orig/drivers/usb/serial/option.c linux-2.6.25/drivers/usb/serial/option.c
--- linux-2.6.25-orig/drivers/usb/serial/option.c	2008-04-17 04:49:44.000000000 +0200
+++ linux-2.6.25/drivers/usb/serial/option.c	2008-04-19 19:05:06.000000000 +0200
@@ -184,6 +184,9 @@
 #define AXESSTEL_VENDOR_ID			0x1726
 #define AXESSTEL_PRODUCT_MV110H			0x1000
 
+#define ONDA_VENDOR_ID				0x19d2
+#define ONDA_PRODUCT_ET502HS			0x0002
+
 #define BANDRICH_VENDOR_ID			0x1A8D
 #define BANDRICH_PRODUCT_C100_1			0x1002
 #define BANDRICH_PRODUCT_C100_2			0x1003
@@ -296,6 +299,7 @@
 	{ USB_DEVICE(ANYDATA_VENDOR_ID, ANYDATA_PRODUCT_ADU_E100A) },
 	{ USB_DEVICE(ANYDATA_VENDOR_ID, ANYDATA_PRODUCT_ADU_500A) },
 	{ USB_DEVICE(AXESSTEL_VENDOR_ID, AXESSTEL_PRODUCT_MV110H) },
+	{ USB_DEVICE(ONDA_VENDOR_ID, ONDA_PRODUCT_ET502HS) },
 	{ USB_DEVICE(BANDRICH_VENDOR_ID, BANDRICH_PRODUCT_C100_1) },
 	{ USB_DEVICE(BANDRICH_VENDOR_ID, BANDRICH_PRODUCT_C100_2) },
 	{ USB_DEVICE(KYOCERA_VENDOR_ID, KYOCERA_PRODUCT_KPC680) },
diff -ruN linux-2.6.25-orig/drivers/usb/storage/unusual_devs.h linux-2.6.25/drivers/usb/storage/unusual_devs.h
--- linux-2.6.25-orig/drivers/usb/storage/unusual_devs.h	2008-04-17 04:49:44.000000000 +0200
+++ linux-2.6.25/drivers/usb/storage/unusual_devs.h	2008-04-19 19:06:18.000000000 +0200
@@ -1520,6 +1520,16 @@
 		US_SC_DEVICE, US_PR_DEVICE, NULL,
 		US_FL_IGNORE_DEVICE),
 
+/* Reported by Mauro Andreolini <andreoli@weblab.ing.unimo.it>
+ * This entry is needed to bypass the ZeroCD mechanism
+ * and to properly load as a modem device.
+ */
+UNUSUAL_DEV(  0x19d2, 0x2000, 0x0000, 0x9999,
+		"Onda ET502HS",
+		"USB MMC Storage",
+		US_SC_DEVICE, US_PR_DEVICE, NULL,
+		US_FL_IGNORE_DEVICE),
+
 /* Reported by Jaco Kroon <jaco@kroon.co.za>
  * The usb-storage module found on the Digitech GNX4 (and supposedly other
  * devices) misbehaves and causes a bunch of invalid I/O errors.