diff --git a/examples/device/dfu/src/main.c b/examples/device/dfu/src/main.c
index 1c09066a..81532ee9 100644
--- a/examples/device/dfu/src/main.c
+++ b/examples/device/dfu/src/main.c
@@ -115,25 +115,20 @@ void tud_resume_cb(void)
   blink_interval_ms = BLINK_MOUNTED;
 }
 
-// Invoked on DFU_DETACH request to reboot to the bootloader
-void tud_dfu_runtime_reboot_to_dfu_cb(void)
-{
-  blink_interval_ms = BLINK_DFU_MODE;
-}
-
 //--------------------------------------------------------------------+
 // Class callbacks
 //--------------------------------------------------------------------+
-bool tud_dfu_firmware_valid_check_cb(void)
+bool tud_dfu_firmware_valid_check_cb(uint8_t alt)
 {
+  (void) alt;
   printf("    Firmware check\r\n");
   return true;
 }
 
-void tud_dfu_req_dnload_data_cb(uint16_t wBlockNum, uint8_t* data, uint16_t length)
+void tud_dfu_req_dnload_data_cb(uint8_t alt, uint16_t wBlockNum, uint8_t* data, uint16_t length)
 {
   (void) data;
-  printf("    Received BlockNum %u of length %u\r\n", wBlockNum, length);
+  printf("    Received Alt %u BlockNum %u of length %u\r\n", alt, wBlockNum, length);
 
 #if DFU_VERBOSE
   for(uint16_t i=0; i<length; i++)
@@ -145,8 +140,9 @@ void tud_dfu_req_dnload_data_cb(uint16_t wBlockNum, uint8_t* data, uint16_t leng
   tud_dfu_dnload_complete();
 }
 
-bool tud_dfu_device_data_done_check_cb(void)
+bool tud_dfu_device_data_done_check_cb(uint8_t alt)
 {
+  (void) alt;
   printf("    Host said no more data... Returning true\r\n");
   return true;
 }
@@ -156,15 +152,16 @@ void tud_dfu_abort_cb(void)
   printf("    Host aborted transfer\r\n");
 }
 
-#define UPLOAD_SIZE (29)
-const uint8_t upload_test[UPLOAD_SIZE] = "Hello world from TinyUSB DFU!";
+#define UPLOAD_SIZE 43
+const uint8_t upload_test[2][UPLOAD_SIZE] = {"Hello world from TinyUSB DFU! - Partition 0",
+                                             "Hello world from TinyUSB DFU! - Partition 1"};
 
-uint16_t tud_dfu_req_upload_data_cb(uint16_t block_num, uint8_t* data, uint16_t length)
+uint16_t tud_dfu_req_upload_data_cb(uint8_t alt, uint16_t block_num, uint8_t* data, uint16_t length)
 {
   (void) block_num;
   (void) length;
 
-  memcpy(data, upload_test, UPLOAD_SIZE);
+  memcpy(data, upload_test[alt], UPLOAD_SIZE);
 
   return UPLOAD_SIZE;
 }
diff --git a/examples/device/dfu/src/usb_descriptors.c b/examples/device/dfu/src/usb_descriptors.c
index 8ad64354..9565da9b 100644
--- a/examples/device/dfu/src/usb_descriptors.c
+++ b/examples/device/dfu/src/usb_descriptors.c
@@ -87,7 +87,7 @@ enum
   ITF_NUM_TOTAL
 };
 
-#define CONFIG_TOTAL_LEN    (TUD_CONFIG_DESC_LEN + TUD_DFU_MODE_DESC_LEN)
+#define CONFIG_TOTAL_LEN    (TUD_CONFIG_DESC_LEN + 2 * TUD_DFU_MODE_DESC_LEN)
 
 #define FUNC_ATTRS (DFU_FUNC_ATTR_CAN_UPLOAD_BITMASK | DFU_FUNC_ATTR_CAN_DOWNLOAD_BITMASK)
 
@@ -97,7 +97,8 @@ uint8_t const desc_configuration[] =
   TUD_CONFIG_DESCRIPTOR(1, ITF_NUM_TOTAL, 0, CONFIG_TOTAL_LEN, TUSB_DESC_CONFIG_ATT_REMOTE_WAKEUP, 100),
 
   // Interface number, string index, attributes, detach timeout, transfer size */
-  TUD_DFU_MODE_DESCRIPTOR(ITF_NUM_DFU_MODE, 0, FUNC_ATTRS, 1000, CFG_TUD_DFU_TRANSFER_BUFFER_SIZE),
+  TUD_DFU_MODE_DESCRIPTOR(ITF_NUM_DFU_MODE, 0, 4, FUNC_ATTRS, 1000, CFG_TUD_DFU_TRANSFER_BUFFER_SIZE),
+  TUD_DFU_MODE_DESCRIPTOR(ITF_NUM_DFU_MODE, 1, 5, FUNC_ATTRS, 1000, CFG_TUD_DFU_TRANSFER_BUFFER_SIZE),
 };
 
 // Invoked when received GET CONFIGURATION DESCRIPTOR
@@ -120,7 +121,8 @@ char const* string_desc_arr [] =
   "TinyUSB",                     // 1: Manufacturer
   "TinyUSB Device",              // 2: Product
   "123456",                      // 3: Serials, should use chip ID
-  "TinyUSB DFU",                 // 4: DFU
+  "FLASH",                       // 4: DFU Partition 1
+  "EEPROM",                      // 5: DFU Partition 2
 };
 
 static uint16_t _desc_str[32];
diff --git a/src/class/dfu/dfu_device.c b/src/class/dfu/dfu_device.c
index c696d70a..0570b595 100644
--- a/src/class/dfu/dfu_device.c
+++ b/src/class/dfu/dfu_device.c
@@ -46,6 +46,7 @@ typedef struct TU_ATTR_PACKED
     dfu_state_t state;
     uint8_t attrs;
     bool blk_transfer_in_proc;
+    uint8_t alt;
     CFG_TUSB_MEM_ALIGN uint8_t transfer_buf[CFG_TUD_DFU_TRANSFER_BUFFER_SIZE];
 } dfu_state_ctx_t;
 
@@ -165,22 +166,29 @@ uint16_t dfu_moded_open(uint8_t rhport, tusb_desc_interface_t const * itf_desc,
   (void) rhport;
   (void) max_len;
 
-  // Ensure this is DFU Mode
-  TU_VERIFY((itf_desc->bInterfaceSubClass == TUD_DFU_APP_SUBCLASS) &&
-            (itf_desc->bInterfaceProtocol == DFU_PROTOCOL_DFU), 0);
+  uint16_t drv_len = 0;
+  uint8_t const * p_desc = (uint8_t*)itf_desc;
 
-  uint8_t const * p_desc = tu_desc_next( itf_desc );
-  uint16_t drv_len = sizeof(tusb_desc_interface_t);
-
-  if ( TUSB_DESC_FUNCTIONAL == tu_desc_type(p_desc) )
+  while (max_len)
   {
-    tusb_desc_dfu_functional_t const *dfu_desc = (tusb_desc_dfu_functional_t const *)p_desc;
-    _dfu_state_ctx.attrs = (uint8_t)dfu_desc->bAttributes;
-
+    // Ensure this is DFU Mode
+    TU_VERIFY((((tusb_desc_interface_t const *)p_desc)->bInterfaceSubClass == TUD_DFU_APP_SUBCLASS) &&
+              (((tusb_desc_interface_t const *)p_desc)->bInterfaceProtocol == DFU_PROTOCOL_DFU), drv_len);
+  
+    p_desc = tu_desc_next( p_desc );
     drv_len += tu_desc_len(p_desc);
-    p_desc   = tu_desc_next(p_desc);
-  }
 
+    if ( TUSB_DESC_FUNCTIONAL == tu_desc_type(p_desc) )
+    {
+      tusb_desc_dfu_functional_t const *dfu_desc = (tusb_desc_dfu_functional_t const *)p_desc;
+      _dfu_state_ctx.attrs = (uint8_t)dfu_desc->bAttributes;
+
+      drv_len += tu_desc_len(p_desc);
+      p_desc   = tu_desc_next(p_desc);
+    }
+
+    max_len -= drv_len;
+  }
   return drv_len;
 }
 
@@ -200,6 +208,8 @@ bool dfu_moded_control_xfer_cb(uint8_t rhport, uint8_t stage, tusb_control_reque
     if ( TUSB_REQ_TYPE_STANDARD == request->bmRequestType_bit.type &&
          TUSB_REQ_SET_INTERFACE == request->bRequest )
     {
+      // Save Alt interface
+      _dfu_state_ctx.alt = request->wValue;
       tud_control_status(rhport, request);
       return true;
     }
@@ -248,7 +258,11 @@ bool dfu_moded_control_xfer_cb(uint8_t rhport, uint8_t stage, tusb_control_reque
 static uint16_t dfu_req_upload(uint8_t rhport, tusb_control_request_t const * request, uint16_t block_num, uint16_t wLength)
 {
   TU_VERIFY( wLength <= CFG_TUD_DFU_TRANSFER_BUFFER_SIZE, 0);
-  uint16_t retval = tud_dfu_req_upload_data_cb(block_num, (uint8_t *)_dfu_state_ctx.transfer_buf, wLength);
+  uint16_t retval = 0;
+  if (tud_dfu_req_upload_data_cb)
+  {
+    tud_dfu_req_upload_data_cb(_dfu_state_ctx.alt, block_num, (uint8_t *)_dfu_state_ctx.transfer_buf, wLength);
+  }
   tud_control_xfer(rhport, request, _dfu_state_ctx.transfer_buf, retval);
   return retval;
 }
@@ -285,7 +299,7 @@ static void dfu_req_dnload_reply(uint8_t rhport, tusb_control_request_t const *
 {
   (void) rhport;
   TU_VERIFY( request->wLength <= CFG_TUD_DFU_TRANSFER_BUFFER_SIZE, );
-  tud_dfu_req_dnload_data_cb(request->wValue, (uint8_t *)_dfu_state_ctx.transfer_buf, request->wLength);
+  tud_dfu_req_dnload_data_cb(_dfu_state_ctx.alt, request->wValue, (uint8_t *)_dfu_state_ctx.transfer_buf, request->wLength);
   _dfu_state_ctx.blk_transfer_in_proc = false;
 }
 
@@ -426,7 +440,7 @@ static bool dfu_state_machine(uint8_t rhport, tusb_control_request_t const * req
               _dfu_state_ctx.blk_transfer_in_proc = true;
               dfu_req_dnload_setup(rhport, request);
             } else {
-              if ( tud_dfu_device_data_done_check_cb() )
+              if ( tud_dfu_device_data_done_check_cb(_dfu_state_ctx.alt) )
               {
                 _dfu_state_ctx.state = DFU_MANIFEST_SYNC;
                 tud_control_status(rhport, request);
@@ -481,7 +495,7 @@ static bool dfu_state_machine(uint8_t rhport, tusb_control_request_t const * req
             _dfu_state_ctx.state = DFU_MANIFEST;
             dfu_req_getstatus_reply(rhport, request);
           } else {
-            if ( tud_dfu_firmware_valid_check_cb() )
+            if ( tud_dfu_firmware_valid_check_cb(_dfu_state_ctx.alt) )
             {
               _dfu_state_ctx.state = DFU_IDLE;
             }
diff --git a/src/class/dfu/dfu_device.h b/src/class/dfu/dfu_device.h
index 9a09a46b..d5bc88ab 100644
--- a/src/class/dfu/dfu_device.h
+++ b/src/class/dfu/dfu_device.h
@@ -39,13 +39,14 @@
 //--------------------------------------------------------------------+
 // Invoked during DFU_MANIFEST_SYNC get status request to check if firmware
 // is valid
-bool tud_dfu_firmware_valid_check_cb(void);
+bool tud_dfu_firmware_valid_check_cb(uint8_t alt);
 
 // Invoked when a DFU_DNLOAD request is received
 // This callback takes the wBlockNum chunk of length length and provides it
 // to the application at the data pointer.  This data is only valid for this
 // call, so the app must use it not or copy it.
-void tud_dfu_req_dnload_data_cb(uint16_t wBlockNum, uint8_t* data, uint16_t length);
+// alt is used as the partition number, in order to multiple partitions like FLASH, EEPROM, etc.
+void tud_dfu_req_dnload_data_cb(uint8_t alt, uint16_t wBlockNum, uint8_t* data, uint16_t length);
 
 // Must be called when the application is done using the last block of data
 // provided by tud_dfu_req_dnload_data_cb
@@ -56,7 +57,7 @@ void tud_dfu_dnload_complete(void);
 // Return true if the application agrees there is no more data
 // Return false if the device disagrees, which will stall the pipe, and the Host
 //              should initiate a recovery procedure
-bool tud_dfu_device_data_done_check_cb(void);
+bool tud_dfu_device_data_done_check_cb(uint8_t alt);
 
 // Invoked when the Host has terminated a download or upload transfer
 TU_ATTR_WEAK void tud_dfu_abort_cb(void);
@@ -64,7 +65,8 @@ TU_ATTR_WEAK void tud_dfu_abort_cb(void);
 // Invoked when a DFU_UPLOAD request is received
 // This callback must populate data with up to length bytes
 // Return the number of bytes to write
-uint16_t tud_dfu_req_upload_data_cb(uint16_t block_num, uint8_t* data, uint16_t length);
+// alt is used as the partition number, in order to multiple partitions like FLASH, EEPROM, etc.
+TU_ATTR_WEAK uint16_t tud_dfu_req_upload_data_cb(uint8_t alt, uint16_t block_num, uint8_t* data, uint16_t length);
 
 //--------------------------------------------------------------------+
 // Internal Class Driver API
diff --git a/src/device/usbd.h b/src/device/usbd.h
index 3857295d..41c78de1 100644
--- a/src/device/usbd.h
+++ b/src/device/usbd.h
@@ -603,11 +603,11 @@ TU_ATTR_WEAK bool tud_vendor_control_xfer_cb(uint8_t rhport, uint8_t stage, tusb
 // Length of template descriptr: 18 bytes
 #define TUD_DFU_MODE_DESC_LEN (9 + 9)
 
-// DFU runtime descriptor
-// Interface number, string index, attributes, detach timeout, transfer size
-#define TUD_DFU_MODE_DESCRIPTOR(_itfnum, _stridx, _attr, _timeout, _xfer_size) \
+// DFU mode descriptor
+// Interface number, alt settings, string index, attributes, detach timeout, transfer size
+#define TUD_DFU_MODE_DESCRIPTOR(_itfnum, _alt, _stridx, _attr, _timeout, _xfer_size) \
   /* Interface */ \
-  9, TUSB_DESC_INTERFACE, _itfnum, 0, 0, TUD_DFU_APP_CLASS, TUD_DFU_APP_SUBCLASS, DFU_PROTOCOL_DFU, _stridx, \
+  9, TUSB_DESC_INTERFACE, _itfnum, _alt, 0, TUD_DFU_APP_CLASS, TUD_DFU_APP_SUBCLASS, DFU_PROTOCOL_DFU, _stridx, \
   /* Function */ \
   9, DFU_DESC_FUNCTIONAL, _attr, U16_TO_U8S_LE(_timeout), U16_TO_U8S_LE(_xfer_size), U16_TO_U8S_LE(0x0101)