diff --git a/boards.txt b/boards.txt
index 61c2cd8c69..dba9ece337 100644
--- a/boards.txt
+++ b/boards.txt
@@ -593,7 +593,7 @@ GenF1.build.board=GenF1
 GenF1.build.mcu=cortex-m3
 GenF1.build.series=STM32F1xx
 GenF1.build.cmsis_lib_gcc=arm_cortexM3l_math
-GenF1.build.extra_flags=-D{build.product_line} {build.enable_usb} {build.xSerial}
+GenF1.build.extra_flags=-D{build.product_line} {build.enable_usb} {build.xSerial} {build.bootloader_flags}
 
 # BLUEPILL_F103C6 board
 GenF1.menu.pnum.BLUEPILL_F103C6=BluePill F103C6 (32K)
@@ -669,6 +669,22 @@ GenF1.menu.upload_method.bmpMethod=BMP (Black Magic Probe)
 GenF1.menu.upload_method.bmpMethod.upload.protocol=gdb_bmp
 GenF1.menu.upload_method.bmpMethod.upload.tool=bmp_upload
 
+GenF1.menu.upload_method.dfu2Method=Maple DFU Bootloader 2.0
+GenF1.menu.upload_method.dfu2Method.upload.protocol=maple
+GenF1.menu.upload_method.dfu2Method.upload.tool=maple_upload
+GenF1.menu.upload_method.dfu2Method.upload.usbID=1EAF:0003
+GenF1.menu.upload_method.dfu2Method.upload.altID=2
+GenF1.menu.upload_method.dfu2Method.build.flash_offset=0x2000
+GenF1.menu.upload_method.dfu2Method.build.bootloader_flags=-DBL_LEGACY_LEAF -DVECT_TAB_OFFSET={build.flash_offset}
+
+GenF1.menu.upload_method.dfuoMethod=Maple DFU Bootloader original
+GenF1.menu.upload_method.dfuoMethod.upload.protocol=maple
+GenF1.menu.upload_method.dfuoMethod.upload.tool=maple_upload
+GenF1.menu.upload_method.dfuoMethod.upload.usbID=1EAF:0003
+GenF1.menu.upload_method.dfuoMethod.upload.altID=1
+GenF1.menu.upload_method.dfuoMethod.build.flash_offset=0x5000
+GenF1.menu.upload_method.dfuoMethod.build.bootloader_flags=-DBL_LEGACY_LEAF -DVECT_TAB_OFFSET={build.flash_offset}
+
 ################################################################################
 # Generic F4
 
diff --git a/cores/arduino/hooks.c b/cores/arduino/hooks.c
index 2d1bc5a491..a85150bca5 100644
--- a/cores/arduino/hooks.c
+++ b/cores/arduino/hooks.c
@@ -16,6 +16,8 @@
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
+#include <stdint.h>
+
 /**
  * Empty yield() hook.
  *
@@ -30,3 +32,21 @@ static void __empty()
   // Empty
 }
 void yield(void) __attribute__((weak, alias("__empty")));
+
+#ifdef DTR_TOGGLING_SEQ
+/**
+ * Empty dtr_toggling() hook.
+ *
+ * This function is intended to be used by library writers to build
+ * libraries or sketches that require DTR toggling feature.
+ *
+ * Its defined as a weak symbol and it can be redefined to implement
+ * task to achieve in this case.
+ */
+static void __empty_dtr_toggling(uint8_t *buf, uint32_t *len)
+{
+  (void)buf;
+  (void)len;
+}
+void dtr_togglingHook(uint8_t *buf, uint32_t *len) __attribute__((weak, alias("__empty_dtr_toggling")));
+#endif
\ No newline at end of file
diff --git a/cores/arduino/stm32/bootloader.c b/cores/arduino/stm32/bootloader.c
new file mode 100644
index 0000000000..a5bb10c0b0
--- /dev/null
+++ b/cores/arduino/stm32/bootloader.c
@@ -0,0 +1,17 @@
+#include "bootloader.h"
+
+#include "stm32_def.h"
+
+#ifdef BL_LEGACY_LEAF
+void dtr_togglingHook(uint8_t *buf, uint32_t *len)
+{
+  /**
+   * Four byte is the magic pack "1EAF" that puts the MCU into bootloader.
+   * Check if the incoming contains the string "1EAF".
+   * If yes, put the MCU into the bootloader mode.
+   */
+  if ((*len >= 4) && (buf[0] == '1') && (buf[1] == 'E') && (buf[2] == 'A') && (buf[3] == 'F')) {
+    NVIC_SystemReset();
+  }
+}
+#endif /* BL_LEGACY_LEAF */
diff --git a/cores/arduino/stm32/bootloader.h b/cores/arduino/stm32/bootloader.h
new file mode 100644
index 0000000000..da3de5bc99
--- /dev/null
+++ b/cores/arduino/stm32/bootloader.h
@@ -0,0 +1,18 @@
+#ifndef _BOOTLOADER_H_
+#define _BOOTLOADER_H_
+
+/* Ensure DTR_TOGGLING_SEQ enabled */
+#ifdef BL_LEGACY_LEAF
+#ifndef DTR_TOGGLING_SEQ
+#define DTR_TOGGLING_SEQ
+#endif /* DTR_TOGGLING_SEQ */
+#endif /* BL_LEGACY_LEAF */
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* _BOOTLOADER_H_ */
diff --git a/cores/arduino/stm32/usb/cdc/usbd_cdc_if.c b/cores/arduino/stm32/usb/cdc/usbd_cdc_if.c
index 041fb46a88..b4b1933a6a 100644
--- a/cores/arduino/stm32/usb/cdc/usbd_cdc_if.c
+++ b/cores/arduino/stm32/usb/cdc/usbd_cdc_if.c
@@ -23,6 +23,7 @@
 /* Includes ------------------------------------------------------------------*/
 #include "usbd_desc.h"
 #include "usbd_cdc_if.h"
+#include "bootloader.h"
 
 #ifdef USE_USB_HS
 #define CDC_MAX_PACKET_SIZE USB_OTG_HS_MAX_PACKET_SIZE
@@ -54,6 +55,11 @@ __IO uint32_t lineState = 0;
 __IO bool receivePended = true;
 static uint32_t transmitStart = 0;
 
+#ifdef DTR_TOGGLING_SEQ
+/* DTR toggling sequence management */
+extern void dtr_togglingHook(uint8_t *buf, uint32_t *len);
+uint8_t dtr_toggling = 0;
+#endif
 
 /** USBD_CDC Private Function Prototypes */
 
@@ -182,6 +188,9 @@ static int8_t USBD_CDC_Control(uint8_t cmd, uint8_t *pbuf, uint16_t length)
       if (lineState) { // Reset the transmit timeout when the port is connected
         transmitStart = 0;
       }
+#ifdef DTR_TOGGLING_SEQ
+      dtr_toggling++; /* Count DTR toggling */
+#endif
       break;
 
     case CDC_SEND_BREAK:
@@ -213,7 +222,14 @@ static int8_t USBD_CDC_Control(uint8_t cmd, uint8_t *pbuf, uint16_t length)
   */
 static int8_t USBD_CDC_Receive(uint8_t *Buf, uint32_t *Len)
 {
+#ifdef DTR_TOGGLING_SEQ
+  if (dtr_toggling > 3) {
+    dtr_togglingHook(Buf, Len);
+    dtr_toggling = 0;
+  }
+#else
   UNUSED(Buf);
+#endif
   /* It always contains required amount of free space for writing */
   CDC_ReceiveQueue_CommitBlock(&ReceiveQueue, (uint16_t)(*Len));
   receivePended = false;
diff --git a/platform.txt b/platform.txt
index c961db3fed..c8ec895fbf 100644
--- a/platform.txt
+++ b/platform.txt
@@ -37,7 +37,7 @@ compiler.cpp.flags={compiler.extra_flags} -c {build.flags.optimize} {compiler.wa
 
 compiler.ar.flags=rcs
 
-compiler.c.elf.flags=-mcpu={build.mcu} -mthumb {build.flags.optimize} {build.flags.ldspecs} -Wl,--defsym=LD_MAX_SIZE={upload.maximum_size} -Wl,--defsym=LD_MAX_DATA_SIZE={upload.maximum_data_size} -Wl,--cref -Wl,--check-sections -Wl,--gc-sections -Wl,--entry=Reset_Handler -Wl,--unresolved-symbols=report-all -Wl,--warn-common
+compiler.c.elf.flags=-mcpu={build.mcu} -mthumb {build.flags.optimize} {build.flags.ldspecs} -Wl,--defsym=LD_FLASH_OFFSET={build.flash_offset} -Wl,--defsym=LD_MAX_SIZE={upload.maximum_size} -Wl,--defsym=LD_MAX_DATA_SIZE={upload.maximum_data_size} -Wl,--cref -Wl,--check-sections -Wl,--gc-sections -Wl,--entry=Reset_Handler -Wl,--unresolved-symbols=report-all -Wl,--warn-common
 
 compiler.objcopy.eep.flags=-O ihex -j .eeprom --set-section-flags=.eeprom=alloc,load --no-change-warnings --change-section-lma .eeprom=0
 
@@ -50,6 +50,7 @@ compiler.define=-DARDUINO=
 
 # These can be overriden in boards.txt
 build.extra_flags=
+build.bootloader_flags=
 build.ldscript=ldscript.ld
 
 # These can be overridden in platform.local.txt
@@ -83,6 +84,7 @@ build.usb_speed=
 build.startup_file=
 build.flags.optimize=-Os
 build.flags.ldspecs=--specs=nano.specs
+build.flash_offset=0
 
 # Pre and post build hooks
 build.opt.name=build_opt.h
@@ -166,3 +168,14 @@ tools.bmp_upload.upload.speed=230400
 tools.bmp_upload.upload.params.verbose=-batch
 tools.bmp_upload.upload.params.quiet=--batch-silent
 tools.bmp_upload.upload.pattern="{path}{cmd}" -nx -b {upload.speed} {upload.verbose} -ex "set confirm off" -ex "target extended-remote {serial.port}" -ex "monitor swdp_scan" -ex "attach 1" -ex "load" -ex "compare-sections" -ex "kill" "{build.path}/{build.project_name}.elf"
+
+# Upload using Maple bootloader over DFU
+tools.maple_upload.cmd=maple_upload
+tools.maple_upload.cmd.windows=maple_upload.bat
+tools.maple_upload.path={runtime.hardware.path}/tools/win
+tools.maple_upload.path.macosx={runtime.hardware.path}/tools/macosx
+tools.maple_upload.path.linux={runtime.hardware.path}/tools/linux
+tools.maple_upload.path.linux64={runtime.hardware.path}/tools/linux64
+tools.maple_upload.upload.params.verbose=-d
+tools.maple_upload.upload.params.quiet=n
+tools.maple_upload.upload.pattern="{path}/{cmd}" {serial.port.file} {upload.altID} {upload.usbID} "{build.path}/{build.project_name}.bin"
diff --git a/variants/BLUEPILL_F103XX/ldscript.ld b/variants/BLUEPILL_F103XX/ldscript.ld
index b56dad0d04..a51c1f685e 100644
--- a/variants/BLUEPILL_F103XX/ldscript.ld
+++ b/variants/BLUEPILL_F103XX/ldscript.ld
@@ -61,7 +61,7 @@ _Min_Stack_Size = 0x400; /* required amount of stack */
 MEMORY
 {
 RAM (xrw)      : ORIGIN = 0x20000000, LENGTH = LD_MAX_DATA_SIZE
-FLASH (rx)      : ORIGIN = 0x8000000, LENGTH = LD_MAX_SIZE
+FLASH (rx)      : ORIGIN = 0x8000000 + LD_FLASH_OFFSET, LENGTH = LD_MAX_SIZE - LD_FLASH_OFFSET
 }
 
 /* Define output sections */
diff --git a/variants/MAPLEMINI_F103CB/ldscript.ld b/variants/MAPLEMINI_F103CB/ldscript.ld
index fca3184d57..23aa50d5ab 100644
--- a/variants/MAPLEMINI_F103CB/ldscript.ld
+++ b/variants/MAPLEMINI_F103CB/ldscript.ld
@@ -52,7 +52,7 @@
 ENTRY(Reset_Handler)
 
 /* Highest address of the user mode stack */
-_estack = 0x20005000;    /* end of RAM */
+_estack = 0x20000000 + LD_MAX_DATA_SIZE;    /* end of RAM */
 /* Generate a link error if heap and stack don't fit into RAM */
 _Min_Heap_Size = 0x200;      /* required amount of heap  */
 _Min_Stack_Size = 0x400; /* required amount of stack */
@@ -60,8 +60,8 @@ _Min_Stack_Size = 0x400; /* required amount of stack */
 /* Specify the memory areas */
 MEMORY
 {
-RAM (xrw)      : ORIGIN = 0x20000000, LENGTH = 20K
-FLASH (rx)      : ORIGIN = 0x8000000, LENGTH = 128K
+RAM (xrw)      : ORIGIN = 0x20000000, LENGTH = LD_MAX_DATA_SIZE
+FLASH (rx)      : ORIGIN = 0x8000000 + LD_FLASH_OFFSET, LENGTH = LD_MAX_SIZE - LD_FLASH_OFFSET
 }
 
 /* Define output sections */