diff --git a/radio/src/opentx.cpp b/radio/src/opentx.cpp
index 7b91842fd06..de2134f5cfe 100644
--- a/radio/src/opentx.cpp
+++ b/radio/src/opentx.cpp
@@ -27,6 +27,10 @@
 #include "tasks.h"
 #include "tasks/mixer_task.h"
 
+#if defined(BLUETOOTH)
+  #include "bluetooth_driver.h"
+#endif
+
 #if defined(LIBOPENUI)
   #include "libopenui.h"
   // #include "shutdown_animation.h"
@@ -1180,6 +1184,12 @@ void opentxStart(const uint8_t startOptions = OPENTX_START_DEFAULT_ARGS)
 
   uint8_t calibration_needed = !(startOptions & OPENTX_START_NO_CALIBRATION) && (g_eeGeneral.chkSum != evalChkSum());
 
+#if defined(BLUETOOTH_PROBE)
+  extern volatile uint8_t btChipPresent;
+  auto oldBtMode = g_eeGeneral.bluetoothMode;
+  g_eeGeneral.bluetoothMode = BLUETOOTH_TELEMETRY;
+#endif
+
 #if defined(GUI)
   if (!calibration_needed && !(startOptions & OPENTX_START_NO_SPLASH)) {
     AUDIO_HELLO();
@@ -1216,6 +1226,12 @@ void opentxStart(const uint8_t startOptions = OPENTX_START_DEFAULT_ARGS)
     PLAY_MODEL_NAME();
   }
 #endif
+
+#if defined(BLUETOOTH_PROBE)
+  if (bluetooth.localAddr[0] != '\0')
+    btChipPresent = 1;
+  g_eeGeneral.bluetoothMode = oldBtMode;
+#endif
 }
 
 void opentxClose(uint8_t shutdown)
diff --git a/radio/src/targets/common/arm/stm32/bluetooth_driver.cpp b/radio/src/targets/common/arm/stm32/bluetooth_driver.cpp
index e8d6629bfa5..24a363fa601 100644
--- a/radio/src/targets/common/arm/stm32/bluetooth_driver.cpp
+++ b/radio/src/targets/common/arm/stm32/bluetooth_driver.cpp
@@ -107,50 +107,6 @@ void bluetoothDisable()
   }
 }
 
-// @Cliff
-// ISR is handled by the serial driver,
-// however, it is unclear at this point
-// how the detection should be implemented.
-// Maybe setting a temporary callback on
-// the interface, or trying to pull some data.
-//
-// Also, it is quite unclear why we would need
-// to disable sending when the TX buffer is exahausted.
-// The serial driver does take care of that but does not
-// set any particular piece of state that could be queried
-// to deduct the state of this TX buffer.
-#if _OBSOLETE_
-extern "C" void BT_USART_IRQHandler(void)
-{
-  DEBUG_INTERRUPT(INT_BLUETOOTH);
-  if (USART_GetITStatus(BT_USART, USART_IT_RXNE) != RESET) {
-    USART_ClearITPendingBit(BT_USART, USART_IT_RXNE);
-    uint8_t byte = USART_ReceiveData(BT_USART);
-    btRxFifo.push(byte);
-#if defined(BLUETOOTH_PROBE)
-    if (!btChipPresent) {
-      // This is to differentiate X7 and X7S and X-Lite with/without BT
-      btChipPresent = 1;
-      bluetoothDisable();
-    }
-#endif
-  }
-
-  if (USART_GetITStatus(BT_USART, USART_IT_TXE) != RESET) {
-    uint8_t byte;
-    bool result = btTxFifo.pop(byte);
-    if (result) {
-      USART_SendData(BT_USART, byte);
-    }
-    else {
-      USART_ITConfig(BT_USART, USART_IT_TXE, DISABLE);
-      // => BLUETOOTH_WRITE_IDLE
-      bluetoothWriteState = BLUETOOTH_WRITE_DONE;
-    }
-  }
-}
-#endif
-
 void bluetoothWrite(const void* buffer, uint32_t len)
 {
   if (!_bt_usart_ctx) return;
diff --git a/radio/src/targets/simu/bt_driver.cpp b/radio/src/targets/simu/bt_driver.cpp
index 2648f5d2690..032fae5bce8 100644
--- a/radio/src/targets/simu/bt_driver.cpp
+++ b/radio/src/targets/simu/bt_driver.cpp
@@ -26,4 +26,5 @@ void bluetoothWrite(const void*, uint32_t) {}
 int bluetoothRead(uint8_t*) { return 0; }
 void bluetoothDisable() {}
 bool bluetoothIsWriting() { return false; }
+volatile uint8_t btChipPresent;