diff --git a/radio/src/targets/common/arm/stm32/intmodule_serial_driver.cpp b/radio/src/targets/common/arm/stm32/intmodule_serial_driver.cpp
index ec7aa2620..8102b5eee 100755
--- a/radio/src/targets/common/arm/stm32/intmodule_serial_driver.cpp
+++ b/radio/src/targets/common/arm/stm32/intmodule_serial_driver.cpp
@@ -105,6 +105,12 @@ extern "C" void INTMODULE_USART_IRQHandler(void)
   }
 }
 
+void intmoduleSendByte(uint8_t byte)
+{
+  while (!(INTMODULE_USART->SR & USART_SR_TXE));
+  USART_SendData(INTMODULE_USART, byte);
+}
+
 void intmoduleSendBuffer(const uint8_t * data, uint8_t size)
 {
   if (size == 0)
diff --git a/radio/src/targets/horus/board.h b/radio/src/targets/horus/board.h
index 8853af830..b8ca84225 100644
--- a/radio/src/targets/horus/board.h
+++ b/radio/src/targets/horus/board.h
@@ -150,6 +150,7 @@ void init_intmodule_heartbeat();
 void check_intmodule_heartbeat();
 
 void intmoduleSerialStart(uint32_t baudrate, uint8_t rxEnable);
+void intmoduleSendByte(uint8_t byte);
 void intmoduleSendBuffer(const uint8_t * data, uint8_t size);
 void intmoduleSendNextFrame();
 
diff --git a/radio/src/targets/horus/hal.h b/radio/src/targets/horus/hal.h
index b2f50ee2b..0d5ca8b3a 100644
--- a/radio/src/targets/horus/hal.h
+++ b/radio/src/targets/horus/hal.h
@@ -565,8 +565,8 @@
 #define INTMODULE_DMA_FLAG_TC           DMA_IT_TCIF7
 #define INTMODULE_DMA_CHANNEL           DMA_Channel_4
 #if defined(PCBX12S)
-  #define INTMODULE_BOOT_GPIO           GPIOI
-  #define INTMODULE_BOOT_GPIO_PIN       GPIO_PIN_9  // PC.02
+  #define INTMODULE_BOOT_GPIO           GPIOC
+  #define INTMODULE_BOOT_GPIO_PIN       GPIO_PIN_2  // PC.02
 #elif defined(PCBX10)
   #define INTMODULE_BOOT_GPIO           GPIOI
   #define INTMODULE_BOOT_GPIO_PIN       GPIO_PIN_9  // PI.09
diff --git a/radio/src/targets/taranis/board.h b/radio/src/targets/taranis/board.h
index 7173aea8a..5c8671e54 100644
--- a/radio/src/targets/taranis/board.h
+++ b/radio/src/targets/taranis/board.h
@@ -122,6 +122,7 @@ uint32_t isBootloaderStart(const uint8_t * buffer);
 #endif
 
 void intmoduleSerialStart(uint32_t baudrate, uint8_t rxEnable);
+void intmoduleSendByte(uint8_t byte);
 void intmoduleSendBuffer(const uint8_t * data, uint8_t size);
 void intmoduleSendNextFrame();