diff --git a/Tools/bootloaders/f4by-ch_bl.bin b/Tools/bootloaders/f4by-ch_bl.bin
new file mode 100755
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diff --git a/Tools/bootloaders/f4by-ch_bl.elf b/Tools/bootloaders/f4by-ch_bl.elf
new file mode 100755
index 0000000000..c4adfcca76
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diff --git a/Tools/bootloaders/f4by-ch_bl.hex b/Tools/bootloaders/f4by-ch_bl.hex
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index 0000000000..b36aefd980
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diff --git a/libraries/AP_HAL_ChibiOS/hwdef/f4by-ch/hwdef-bl.dat b/libraries/AP_HAL_ChibiOS/hwdef/f4by-ch/hwdef-bl.dat
new file mode 100644
index 0000000000..21d2f5249a
--- /dev/null
+++ b/libraries/AP_HAL_ChibiOS/hwdef/f4by-ch/hwdef-bl.dat
@@ -0,0 +1,45 @@
+# hw definition file for processing by chibios_hwdef.py
+# for f4by bootloader
+
+MCU STM32F4xx STM32F407xx
+
+APJ_BOARD_ID 20
+
+OSCILLATOR_HZ 8000000
+STM32_PLLM_VALUE 8
+
+
+# board voltage
+STM32_VDD 330U
+
+STM32_ST_USE_TIMER 5
+
+# flash size
+FLASH_SIZE_KB 1024
+
+# order of UARTs (and USB)
+UART_ORDER OTG1 USART2
+
+PE3 LED_BOOTLOADER OUTPUT
+PE2 LED_ACTIVITY OUTPUT
+define HAL_LED_ON 1
+
+PA9 VBUS INPUT
+
+PA11 OTG_FS_DM OTG1
+PA12 OTG_FS_DP OTG1
+
+PA13 JTMS-SWDIO SWD
+PA14 JTCK-SWCLK SWD
+
+PD5 USART2_TX USART2
+PD6 USART2_RX USART2
+
+FLASH_USE_MAX_KB 16
+FLASH_RESERVE_START_KB 0
+
+define HAL_USE_EMPTY_STORAGE 1
+define HAL_STORAGE_SIZE 16384
+
+# location of application code
+define FLASH_BOOTLOADER_LOAD_KB 16
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/f4by-ch/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/f4by-ch/hwdef.dat
index 06c1cafcac..c3ae77bf22 100755
--- a/libraries/AP_HAL_ChibiOS/hwdef/f4by-ch/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/f4by-ch/hwdef.dat
@@ -5,7 +5,7 @@
 MCU STM32F4xx STM32F407xx
 
 # board ID for firmware load
-APJ_BOARD_ID 129
+APJ_BOARD_ID 20
 define CONFIG_HAL_BOARD_SUBTYPE HAL_BOARD_SUBTYPE_CHIBIOS_F4BY
                                 
 # USB setup