diff --git a/radio/src/CMakeLists.txt b/radio/src/CMakeLists.txt
index 41cd7ce1a..5b3a624c1 100644
--- a/radio/src/CMakeLists.txt
+++ b/radio/src/CMakeLists.txt
@@ -841,7 +841,7 @@ endif()
 if(CPU_FAMILY STREQUAL STM32)
   add_custom_target(flash
     COMMAND dfu-util --alt 0 --dfuse-address 0x08000000 -D firmware.bin
-    DEPENDS firmware.bin
+    DEPENDS firmware
     WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
   )
 endif()
diff --git a/radio/src/cli.cpp b/radio/src/cli.cpp
index 6d1a7bb16..73de8c35d 100644
--- a/radio/src/cli.cpp
+++ b/radio/src/cli.cpp
@@ -2,7 +2,7 @@
  * Copyright (C) OpenTX
  *
  * Based on code named
- *   th9x - http://code.google.com/p/th9x 
+ *   th9x - http://code.google.com/p/th9x
  *   er9x - http://code.google.com/p/er9x
  *   gruvin9x - http://code.google.com/p/gruvin9x
  *
@@ -280,6 +280,13 @@ int cliDisplay(const char ** argv)
   else if (!strcmp(argv[1], "volume")) {
     serialPrint("volume = %d", getVolume());
   }
+#if defined(CPUSTM32)
+  else if (!strcmp(argv[1], "uid")) {
+    char str[LEN_CPU_UID+1];
+    getCPUUniqueID(str);
+    serialPrint("uid = %s", str);
+  }
+#endif
 #if defined(PCBFLAMENCO)
   else if (!strcmp(argv[1], "bq24195")) {
     {
@@ -379,7 +386,7 @@ const CliCommand cliCommands[] = {
 };
 
 int cliHelp(const char ** argv)
-{ 
+{
   for (const CliCommand * command = cliCommands; command->name != NULL; command++) {
     if (argv[1][0] == '\0' || !strcmp(command->name, argv[0])) {
       serialPrint("%s %s", command->name, command->args);
diff --git a/radio/src/strhelpers.cpp b/radio/src/strhelpers.cpp
index b387d4434..bce2f0258 100644
--- a/radio/src/strhelpers.cpp
+++ b/radio/src/strhelpers.cpp
@@ -155,13 +155,14 @@ char * strAppendNumber(char * dest, unsigned int value, uint8_t digits, uint8_t
       tmp /= radix;
     }
   }
-  dest[digits] = '\0';
-  while(digits > 0) {
+  uint8_t idx = digits;
+  while(idx > 0) {
     div_t qr = div(value, radix);
-    dest[--digits] = (qr.rem >= 10 ? 'A' : '0') + qr.rem;
+    dest[--idx] = (qr.rem >= 10 ? 'A'-10 : '0') + qr.rem;
     value = qr.quot;
   }
-  return dest + digits;
+  dest[digits] = '\0';
+  return &dest[digits];
 }
 
 #if defined(CPUARM) || defined(SDCARD)
diff --git a/radio/src/targets/horus/board_horus.cpp b/radio/src/targets/horus/board_horus.cpp
index 02d90e4b4..c9c715760 100644
--- a/radio/src/targets/horus/board_horus.cpp
+++ b/radio/src/targets/horus/board_horus.cpp
@@ -2,7 +2,7 @@
  * Copyright (C) OpenTX
  *
  * Based on code named
- *   th9x - http://code.google.com/p/th9x 
+ *   th9x - http://code.google.com/p/th9x
  *   er9x - http://code.google.com/p/er9x
  *   gruvin9x - http://code.google.com/p/gruvin9x
  *
@@ -39,6 +39,16 @@ void watchdogInit(unsigned int duration)
   IWDG->KR = 0xCCCC ;      // start
 }
 
+void getCPUUniqueID(char * s)
+{
+  uint32_t * cpu_uid = (uint32_t *)0x1FFF7A10;
+  char * tmp = strAppendNumber(s, cpu_uid[0], 8, 16);
+  *tmp = ' ';
+  tmp = strAppendNumber(tmp+1, cpu_uid[1], 8, 16);
+  *tmp = ' ';
+  strAppendNumber(tmp+1, cpu_uid[2], 8, 16);
+}
+
 // Start TIMER7 at 2000000Hz
 void init2MhzTimer()
 {
@@ -144,19 +154,19 @@ extern USB_OTG_CORE_HANDLE USB_OTG_dev;
   Prepare and send new USB data packet
 
   The format of HID_Buffer is defined by
-  USB endpoint description can be found in 
+  USB endpoint description can be found in
   file usb_hid_joystick.c, variable HID_JOYSTICK_ReportDesc
 */
 void usbJoystickUpdate(void)
 {
   static uint8_t HID_Buffer[HID_IN_PACKET];
-  
+
   //buttons
   HID_Buffer[0] = 0; //buttons
   for (int i = 0; i < 8; ++i) {
     if ( channelOutputs[i+8] > 0 ) {
       HID_Buffer[0] |= (1 << i);
-    } 
+    }
   }
 
   //analog values
@@ -165,7 +175,7 @@ void usbJoystickUpdate(void)
     int16_t value = channelOutputs[i] / 8;
     if ( value > 127 ) value = 127;
     else if ( value < -127 ) value = -127;
-    HID_Buffer[i+1] = static_cast<int8_t>(value);  
+    HID_Buffer[i+1] = static_cast<int8_t>(value);
   }
 
   USBD_HID_SendReport (&USB_OTG_dev, HID_Buffer, HID_IN_PACKET );
@@ -220,4 +230,4 @@ void checkTrainerSettings()
         break;
     }
   }
-}
\ No newline at end of file
+}
diff --git a/radio/src/targets/horus/board_horus.h b/radio/src/targets/horus/board_horus.h
index 7d829ffc0..3a34a796f 100644
--- a/radio/src/targets/horus/board_horus.h
+++ b/radio/src/targets/horus/board_horus.h
@@ -2,7 +2,7 @@
  * Copyright (C) OpenTX
  *
  * Based on code named
- *   th9x - http://code.google.com/p/th9x 
+ *   th9x - http://code.google.com/p/th9x
  *   er9x - http://code.google.com/p/er9x
  *   gruvin9x - http://code.google.com/p/gruvin9x
  *
@@ -116,6 +116,10 @@ void delay_ms(uint16_t nb);
 }
 #endif
 
+// CPU Unique ID
+#define LEN_CPU_UID                    (3*8+2)
+void getCPUUniqueID(char * s);
+
 // SD driver
 #if !defined(SIMU) || defined(SIMU_DISKIO)
   uint32_t sdIsHC(void);
diff --git a/radio/src/targets/taranis/board_taranis.cpp b/radio/src/targets/taranis/board_taranis.cpp
index 1147fbad3..ce835c1bb 100644
--- a/radio/src/targets/taranis/board_taranis.cpp
+++ b/radio/src/targets/taranis/board_taranis.cpp
@@ -39,6 +39,16 @@ void watchdogInit(unsigned int duration)
   IWDG->KR = 0xCCCC ;      // start
 }
 
+void getCPUUniqueID(char * s)
+{
+  uint32_t * cpu_uid = (uint32_t *)0x1FFF7A10;
+  char * tmp = strAppendNumber(s, cpu_uid[0], 8, 16);
+  *tmp = ' ';
+  tmp = strAppendNumber(tmp+1, cpu_uid[1], 8, 16);
+  *tmp = ' ';
+  strAppendNumber(tmp+1, cpu_uid[2], 8, 16);
+}
+
 // Starts TIMER at 2MHz
 void init2MhzTimer()
 {
diff --git a/radio/src/targets/taranis/board_taranis.h b/radio/src/targets/taranis/board_taranis.h
index afa2659a9..935297eff 100644
--- a/radio/src/targets/taranis/board_taranis.h
+++ b/radio/src/targets/taranis/board_taranis.h
@@ -144,6 +144,10 @@ void delay(uint32_t ms);
 }
 #endif
 
+// CPU Unique ID
+#define LEN_CPU_UID                    (3*8+2)
+void getCPUUniqueID(char * s);
+
 // SD driver
 #if !defined(SIMU) || defined(SIMU_DISKIO)
   uint32_t sdIsHC(void);