diff --git a/radio/src/io/frsky_device_firmware_update.cpp b/radio/src/io/frsky_device_firmware_update.cpp
index 37c42e811..2fd6d484e 100644
--- a/radio/src/io/frsky_device_firmware_update.cpp
+++ b/radio/src/io/frsky_device_firmware_update.cpp
@@ -77,12 +77,6 @@ void DeviceFirmwareUpdate::startup()
       break;
 #endif
 
-    case EXTERNAL_MODULE:
-#if defined(EXTMODULE_USART)
-      extmoduleInvertedSerialStart(57600);
-      break;
-#endif
-
     default:
       telemetryInit(PROTOCOL_TELEMETRY_FRSKY_SPORT);
       break;
@@ -137,11 +131,6 @@ const uint8_t * DeviceFirmwareUpdate::readFrame(uint32_t timeout)
       return readFullDuplexFrame(intmoduleFifo, timeout);
 #endif
 
-    case EXTERNAL_MODULE:
-#if defined(EXTMODULE_USART)
-      return readFullDuplexFrame(extmoduleFifo, timeout);
-#endif
-
     default:
       return readHalfDuplexFrame(timeout);
   }
@@ -196,11 +185,6 @@ void DeviceFirmwareUpdate::sendFrame()
       return intmoduleSendBuffer(outputTelemetryBuffer, ptr-outputTelemetryBuffer);
 #endif
 
-    case EXTERNAL_MODULE:
-#if defined(EXTMODULE_USART)
-      return extmoduleSendBuffer(outputTelemetryBuffer, ptr-outputTelemetryBuffer);
-#endif
-
     default:
       return sportSendBuffer(outputTelemetryBuffer, ptr-outputTelemetryBuffer);
   }