diff --git a/CH32V203/src/USBLib/usb_core.c b/CH32V203/src/USBLib/usb_core.c
index 0d50c13..1f29210 100644
--- a/CH32V203/src/USBLib/usb_core.c
+++ b/CH32V203/src/USBLib/usb_core.c
@@ -653,6 +653,13 @@ void Data_Setup0(void)
       {
         CopyRoutine = pProperty->GetConfigDescriptor;
       }
+#ifndef DAP_FW_V1
+      else if (wValue1 == DESC_BOS)
+      {
+        uint8_t *USBD_GetBOSDescriptor(uint16_t Length);
+        CopyRoutine = USBD_GetBOSDescriptor;
+      }
+#endif
       else if (wValue1 == STRING_DESCRIPTOR)
       {
         CopyRoutine = pProperty->GetStringDescriptor;
@@ -717,6 +724,14 @@ void Data_Setup0(void)
     }
 
   }
+#ifndef DAP_FW_V1
+  else if((Type_Recipient & REQUEST_TYPE) == VENDOR_REQUEST)
+  {
+    uint8_t *USBD_MS_OS_20_DescriptorSet(uint16_t Length);
+    if((Request_No == WINUSB_VENDOR_CODE) && (pInformation->USBwIndex0 == 7))
+      CopyRoutine = USBD_MS_OS_20_DescriptorSet;
+  }
+#endif
   
   if (CopyRoutine)
   {
diff --git a/CH32V203/src/USBUsr/usb_conf.h b/CH32V203/src/USBUsr/usb_conf.h
index fe8a4b0..f49eefb 100644
--- a/CH32V203/src/USBUsr/usb_conf.h
+++ b/CH32V203/src/USBUsr/usb_conf.h
@@ -69,6 +69,13 @@
 
 
 
+#define DESC_BOS            0x0F
+#define DESC_CAPABILITY     0x10
+
+#define WINUSB_VENDOR_CODE  0x34
+
+
+
 #include "ch32v20x.h"
 
 void Delay_Ms(uint32_t n);
diff --git a/CH32V203/src/USBUsr/usb_desc.c b/CH32V203/src/USBUsr/usb_desc.c
index f4ec47b..b6d8ad7 100644
--- a/CH32V203/src/USBUsr/usb_desc.c
+++ b/CH32V203/src/USBUsr/usb_desc.c
@@ -57,7 +57,7 @@ const uint8_t  USBD_ConfigDescriptor[] = {
 #endif
     0x00,                               // bInterfaceSubClass
     0x00,                               // bInterfaceProtocol
-    0x00,                               // iInterface
+    0x04,                               // iInterface
 
 #ifdef DAP_FW_V1
     // HID Descriptor
@@ -208,6 +208,13 @@ uint8_t USBD_StringSerial[] = {
 };
 
 
+const uint8_t USBD_StringInterface[] = {
+    USBD_SIZE_STRING_PRODUCT,
+    STRING_DESCRIPTOR,
+    'X', 0, 'V', 0, '-', 0, 'L', 0, 'i', 0, 'n', 0, 'k', 0, ' ', 0, 'C', 0, 'M', 0, 'S', 0, 'I', 0, 'S', 0, '-', 0, 'D', 0, 'A', 0, 'P', 0
+};
+
+
 const uint8_t USBD_HidRepDesc[] =
 {
     0x06, 0x00, 0xFF,   // Usage Page = 0xFF00 (Vendor Defined Page 1)
@@ -226,3 +233,95 @@ const uint8_t USBD_HidRepDesc[] =
     0xC0                // End Collection
 };
 
+
+
+uint8_t BOS_Descriptor[] =
+{
+    5,
+    DESC_BOS,
+    5+20+8, 0,                  // wTotalLength
+    1,                          // bNumDeviceCaps
+
+    /*** MS OS 2.0 descriptor platform capability descriptor ***/
+    28,
+    DESC_CAPABILITY,
+    5,                          // bDevCapabilityType: PLATFORM (05H)
+    0x00,
+    0xDF, 0x60, 0xDD, 0xD8,     // PlatformCapabilityUUID: MS_OS_20_Platform_Capability_ID (D8DD60DF-4589-4CC7-9CD2-659D9E648A9F)
+    0x89, 0x45, 0xC7, 0x4C,
+    0x9C, 0xD2, 0x65, 0x9D,
+    0x9E, 0x64, 0x8A, 0x9F,
+
+    0x00, 0x00, 0x03, 0x06,     // dwWindowsVersion: 0x06030000 for Windows 8.1
+    10+8+20+128, 0x00,          // wTotalLength: size of MS OS 2.0 descriptor set
+    WINUSB_VENDOR_CODE,         // bMS_VendorCode
+    0x00,                       // bAltEnumCmd
+};
+
+uint8_t *USBD_GetBOSDescriptor(uint16_t Length)
+{
+    static ONE_DESCRIPTOR bos_descriptor =
+    {
+        (uint8_t*)BOS_Descriptor,
+        sizeof(BOS_Descriptor)
+    };
+
+    return Standard_GetDescriptorData(Length, &bos_descriptor);
+}
+
+
+#define MS_OS_20_SET_HEADER_DESCRIPTOR        0x00
+#define MS_OS_20_SUBSET_HEADER_CONFIGURATION  0x01
+#define MS_OS_20_SUBSET_HEADER_FUNCTION       0x02
+#define MS_OS_20_FEATURE_COMPATIBLE_ID        0x03
+#define MS_OS_20_FEATURE_REG_PROPERTY         0x04
+#define MS_OS_20_FEATURE_MIN_RESUME_TIME      0x05
+#define MS_OS_20_FEATURE_MODEL_ID             0x06
+#define MS_OS_20_FEATURE_CCGP_DEVICE          0x07
+#define MS_OS_20_FEATURE_VENDOR_REVISION      0x08
+
+uint8_t MS_OS_20_DescriptorSet[] =
+{
+    /*** Microsoft OS 2.0 Descriptor Set Header ***/
+    10, 0,
+    MS_OS_20_SET_HEADER_DESCRIPTOR, 0,
+    0x00, 0x00, 0x03, 0x06,     // dwWindowsVersion: 0x06030000 for Windows 8.1
+    10+8+20+128, 0,             // wTotalLength
+
+    /*** Microsoft OS 2.0 function subset header ***/
+    8, 0,
+    MS_OS_20_SUBSET_HEADER_FUNCTION, 0,
+    0,                          // bFirstInterface, first interface to which this subset applies
+    0,
+    8+20+128, 0,                // wSubsetLength
+
+    /*** Microsoft OS 2.0 compatible ID descriptor ***/
+    20, 0,
+    MS_OS_20_FEATURE_COMPATIBLE_ID, 0,
+    'W',  'I',  'N',  'U',  'S',  'B',  0x00, 0x00,     // CompatibleID
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,     // SubCompatibleID
+
+    /*** MS OS 2.0 registry property descriptor ***/
+    128, 0,
+    MS_OS_20_FEATURE_REG_PROPERTY, 0,
+    1, 0,                       // wPropertyDataType: 1 = Unicode REG_SZ
+    40, 0x00,                   // wPropertyNameLength
+    'D', 0, 'e', 0, 'v', 0, 'i', 0, 'c', 0, 'e', 0, 'I', 0, 'n', 0, 't', 0, 'e', 0,
+    'r', 0, 'f', 0, 'a', 0, 'c', 0, 'e', 0, 'G', 0, 'U', 0, 'I', 0, 'D', 0,   0, 0,     // PropertyName: "DeviceInterfaceGUID"
+    78, 0x00,                   // wPropertyDataLength
+    '{', 0, 'C', 0, 'D', 0, 'B', 0, '3', 0, 'B', 0, '5', 0, 'A', 0, 'D', 0, '-', 0,
+    '2', 0, '9', 0, '3', 0, 'B', 0, '-', 0, '4', 0, '6', 0, '6', 0, '3', 0, '-', 0,
+    'A', 0, 'A', 0, '3', 0, '6', 0, '-', 0, '1', 0, 'A', 0, 'A', 0, 'E', 0, '4', 0,
+    '6', 0, '4', 0, '6', 0, '3', 0, '7', 0, '7', 0, '6', 0, '}', 0,   0, 0,             // PropertyData: "{CDB3B5AD-293B-4663-AA36-1AAE46463776}"
+};
+
+uint8_t *USBD_MS_OS_20_DescriptorSet(uint16_t Length)
+{
+    static ONE_DESCRIPTOR ms_os_20_descriptorSet =
+    {
+        (uint8_t*)MS_OS_20_DescriptorSet,
+        sizeof(MS_OS_20_DescriptorSet)
+    };
+
+    return Standard_GetDescriptorData(Length, &ms_os_20_descriptorSet);
+}
diff --git a/CH32V203/src/USBUsr/usb_desc.h b/CH32V203/src/USBUsr/usb_desc.h
index f803dfd..6149c4d 100644
--- a/CH32V203/src/USBUsr/usb_desc.h
+++ b/CH32V203/src/USBUsr/usb_desc.h
@@ -15,11 +15,11 @@
 #include "ch32v20x.h"
 
 
-#define USBD_VID    0x0416
+#define USBD_VID    0x1A86
 #ifdef DAP_FW_V1
-#define USBD_PID    0x5051
+#define USBD_PID    0x5021
 #else
-#define USBD_PID    0x7887
+#define USBD_PID    0x7021
 #endif
 
 
@@ -63,6 +63,7 @@ extern const uint8_t USBD_ConfigDescriptor[];
 extern const uint8_t USBD_StringLangID [];
 extern const uint8_t USBD_StringVendor [];
 extern const uint8_t USBD_StringProduct[];
+extern const uint8_t USBD_StringInterface[];
 extern const uint8_t USBD_HidRepDesc[];
 extern uint8_t USBD_StringSerial [];
 
diff --git a/CH32V203/src/USBUsr/usb_prop.c b/CH32V203/src/USBUsr/usb_prop.c
index 1e283b1..1cace6b 100644
--- a/CH32V203/src/USBUsr/usb_prop.c
+++ b/CH32V203/src/USBUsr/usb_prop.c
@@ -68,12 +68,13 @@ ONE_DESCRIPTOR Config_Descriptor =
 	USBD_SIZE_CONFIG_TOTAL
 };
 
-ONE_DESCRIPTOR String_Descriptor[4] =
+ONE_DESCRIPTOR String_Descriptor[5] =
 {
-	{(uint8_t*)USBD_StringLangID, USBD_SIZE_STRING_LANGID},
-	{(uint8_t*)USBD_StringVendor, USBD_SIZE_STRING_VENDOR},
-	{(uint8_t*)USBD_StringProduct,USBD_SIZE_STRING_PRODUCT},
-	{(uint8_t*)USBD_StringSerial, USBD_SIZE_STRING_SERIAL}
+	{(uint8_t*)USBD_StringLangID,   USBD_SIZE_STRING_LANGID},
+	{(uint8_t*)USBD_StringVendor,   USBD_SIZE_STRING_VENDOR},
+	{(uint8_t*)USBD_StringProduct,  USBD_SIZE_STRING_PRODUCT},
+	{(uint8_t*)USBD_StringSerial,   USBD_SIZE_STRING_SERIAL},
+	{(uint8_t*)USBD_StringInterface,USBD_SIZE_STRING_PRODUCT}
 };
 
 ONE_DESCRIPTOR Report_Descriptor[1] =
diff --git a/CH32V203/src/main.c b/CH32V203/src/main.c
index 27a8cfd..8c67e46 100644
--- a/CH32V203/src/main.c
+++ b/CH32V203/src/main.c
@@ -5,6 +5,13 @@
 #include "DAP.h"
 #include "vcom_serial.h"
 
+
+/* 在 Properties for DAPLink -> C/C++ Build -> Settings -> C Compiler -> Preprocessor 中：
+   定义 DAP_FW_V1：   生成 CMSIS-DAP v1 固件，使用 HID 传输协议
+   不定义 DAP_FW_V1： 生成 CMSIS-DAP v2 固件，使用 WINUSB 传输协议
+*/
+
+
 extern uint8_t usbd_hid_process(void);
 
 volatile uint32_t SysTick_ms = 0;
diff --git a/README.md b/README.md
index 7a20d5b..74ca28b 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ DAPLink (CMSIS-DAP) based on Artery AT32F425 (support crystal-less USB), support
 
 On C/C++ page of Keil Option Window:
 * Define `DAP_FW_V1`: generate CMSIS-DAP V1 firmware, using HID transport protocol.
-* Do not define `DAP_FW_V1`: Generate CMSIS-DAP V2 firmware, using WINUSB transfer protocol.
+* Do not define `DAP_FW_V1`: generate CMSIS-DAP V2 firmware, using WINUSB transfer protocol.
 
 ### Pin map
 |  FUNC    | Pin   |
@@ -24,6 +24,10 @@ Sch & PCB: [https://oshwhub.com/xivn1987/daplink](https://oshwhub.com/xivn1987/d
 ## DAPLink-CH32V203
 DAPLink (CMSIS-DAP) based on WCH CH32V203 (support crystal-less USB), supports SWD, JTAG and CDC.
 
+On Properties for DAPLink -> C/C++ Build -> Settings -> C Compiler -> Preprocessor page:
+* Define `DAP_FW_V1`: generate CMSIS-DAP V1 firmware, using HID transport protocol.
+* Do not define `DAP_FW_V1`: generate CMSIS-DAP V2 firmware, using WINUSB transfer protocol.
+
 ### Pin map
 |  FUNC    | Pin   |
 |  :----   | :---- |