diff --git a/hardware/arduino/firmwares/arduino-usbdfu/Descriptors.c b/hardware/arduino/firmwares/arduino-usbdfu/Descriptors.c
index bb5ecfefe..4deaa0625 100755
--- a/hardware/arduino/firmwares/arduino-usbdfu/Descriptors.c
+++ b/hardware/arduino/firmwares/arduino-usbdfu/Descriptors.c
@@ -53,8 +53,8 @@ USB_Descriptor_Device_t DeviceDescriptor =
 				
 	.Endpoint0Size          = FIXED_CONTROL_ENDPOINT_SIZE,
 		
-	.VendorID               = 0x03EB,
-	.ProductID              = PRODUCT_ID_CODE,
+	.VendorID               = 0x03EB, // Atmel
+	.ProductID              = PRODUCT_ID_CODE, // MCU-dependent
 	.ReleaseNumber          = 0x0000,
 		
 	.ManufacturerStrIndex   = NO_DESCRIPTOR,
diff --git a/hardware/arduino/firmwares/arduino-usbserial/Descriptors.c b/hardware/arduino/firmwares/arduino-usbserial/Descriptors.c
index ae55c934e..04bdf9895 100755
--- a/hardware/arduino/firmwares/arduino-usbserial/Descriptors.c
+++ b/hardware/arduino/firmwares/arduino-usbserial/Descriptors.c
@@ -65,9 +65,9 @@ USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 				
 	.Endpoint0Size          = FIXED_CONTROL_ENDPOINT_SIZE,
 		
-	.VendorID               = 0x2341,
+	.VendorID               = 0x03EB, // Atmel
 
-	.ProductID          	= ARDUINO_MODEL_PID,
+	.ProductID          	= 0x2018, // PID_MegaCDC
 	.ReleaseNumber          = 0x0000,
 		
 	.ManufacturerStrIndex   = 0x01,