diff --git a/SerialArduino.cpp b/SerialArduino.cpp
index c146ae71..db497597 100644
--- a/SerialArduino.cpp
+++ b/SerialArduino.cpp
@@ -26,29 +26,8 @@
 
 #elif defined(__SAM3X8E__) || defined(__MK20DX256__) || defined(__MK64FX512__) || defined(__MK66FX1M0__)
 
-
-#if defined(__SAM3X8E__)
-extern "C" {
-  #include <stdio.h>
-}
-
-extern char UDID[];
-
-#define FLASH_ACCESS_MODE_128     0
-#define EFC0                      (0x400E0A00U)
-#define EFC                       ((Efc*)EFC0)
-
-#endif
-
 void CSerialPort::beginInt(uint8_t n, int speed)
 {
-#if defined(__SAM3X8E__)
-  uint32_t _id[4];
-  if (0 == efc_init(EFC, FLASH_ACCESS_MODE_128, 4))
-    if (0 == efc_perform_read_sequence(EFC, EFC_FCMD_STUI, EFC_FCMD_SPUI, _id, 4))
-      ::sprintf(UDID,"%08X%08X%08X%08X",_id[0],_id[1],_id[2],_id[3]);
-#endif
-
   switch (n) {
     case 1U:
       Serial.begin(speed);
diff --git a/SerialPort.cpp b/SerialPort.cpp
index 23990ccd..99fa62e0 100644
--- a/SerialPort.cpp
+++ b/SerialPort.cpp
@@ -92,7 +92,7 @@ const uint8_t MMDVM_DEBUG5       = 0xF5U;
 #endif
 
 #if defined(STM32F4_RPT_HAT_TGO)
-#define HW_TYPE "MMDVM RPT_HAT_TGO"
+#define HW_TYPE "MMDVM_RPT_HAT_TGO"
 #else
 #define HW_TYPE "MMDVM"
 #endif
@@ -109,7 +109,6 @@ const char HARDWARE[] = concat(HW_TYPE, DESCRIPTION, TCXO, __TIME__, __DATE__);
 
 const uint8_t PROTOCOL_VERSION   = 1U;
 
-char UDID[] = "00000000000000000000000000000000";
 
 CSerialPort::CSerialPort() :
 m_buffer(),
@@ -238,7 +237,7 @@ void CSerialPort::getStatus()
 
 void CSerialPort::getVersion()
 {
-  uint8_t reply[192U];
+  uint8_t reply[150U];
 
   reply[0U] = MMDVM_FRAME_START;
   reply[1U] = 0U;
@@ -250,10 +249,6 @@ void CSerialPort::getVersion()
   for (uint8_t i = 0U; HARDWARE[i] != 0x00U; i++, count++)
     reply[count] = HARDWARE[i];
 
-  reply[count++] = '\0';
-  for (uint8_t i = 0U; UDID[i] != 0x00U; i++, count++)
-    reply[count] = UDID[i];
-
   reply[1U] = count;
 
   writeInt(1U, reply, count);
diff --git a/SerialSTM.cpp b/SerialSTM.cpp
index 1d79311d..8b4ae527 100644
--- a/SerialSTM.cpp
+++ b/SerialSTM.cpp
@@ -834,25 +834,9 @@ void WriteUART5(const uint8_t* data, uint16_t length)
 
 #endif
 /////////////////////////////////////////////////////////////////
-extern char UDID[];
-extern "C" {
-   #include <stdio.h>
-}
 
 void CSerialPort::beginInt(uint8_t n, int speed)
 {
-#if defined(STM32F4XX)
-   uint32_t *id0 =  (uint32_t *) (0x1FFF7A10);
-   uint32_t *id1 =  (uint32_t *) (0x1FFF7A10 + 0x04);
-   uint32_t *id2 =  (uint32_t *) (0x1FFF7A10 + 0x08);
-   ::sprintf(UDID, "%08X%08X%08X", *id0,*id1,*id2);
-#elif defined(STM32F7XX)
-   uint32_t *id0 =  (uint32_t *) (0x1FF0F420);
-   uint32_t *id1 =  (uint32_t *) (0x1FF0F420 + 0x04);
-   uint32_t *id2 =  (uint32_t *) (0x1FF0F420 + 0x08);
-   ::sprintf(UDID, "%08X%08X%08X", *id0,*id1,*id2);
-#endif
-
    switch (n) {
       case 1U:
          #if defined(STM32F4_DISCOVERY) || defined(STM32F7_NUCLEO)
diff --git a/SerialSTM_CMSIS.cpp b/SerialSTM_CMSIS.cpp
index b7f43991..38127ac5 100644
--- a/SerialSTM_CMSIS.cpp
+++ b/SerialSTM_CMSIS.cpp
@@ -106,21 +106,9 @@ RAMFUNC void USART1TxData(const uint8_t* data, uint16_t length)
 
 
 /////////////////////////////////////////////////////////////////
-extern char UDID[];
-extern "C" {
-  #include <stdio.h>
-}
 
 void CSerialPort::beginInt(uint8_t n, int speed)
 {
-#if defined(STM32F105xC)
-   uint16_t *id00 =  (uint16_t *) (0x1FFFF7E8);
-   uint16_t *id01 =  (uint16_t *) (0x1FFFF7E8 + 0x02);
-   uint32_t *id1 =  (uint32_t *) (0x1FFFF7E8 + 0x04);
-   uint32_t *id2 =  (uint32_t *) (0x1FFFF7E8 + 0x08);
-   ::sprintf(UDID, "%04X%04X%08X%08X", *id00,*id01,*id1,*id2);
-#endif
-
   switch (n) {
     case 1U:
       USART1Init(speed);