diff --git a/radio/src/pulses/pxx2.cpp b/radio/src/pulses/pxx2.cpp
index 28e65947b..ad4e2cde5 100644
--- a/radio/src/pulses/pxx2.cpp
+++ b/radio/src/pulses/pxx2.cpp
@@ -104,7 +104,7 @@ void Pxx2Pulses::setupChannelsFrame(uint8_t module)
   }
 }
 
-bool Pxx2Pulses::setupRegisterFrame(uint8_t module)
+void Pxx2Pulses::setupRegisterFrame(uint8_t module)
 {
   addFrameType(PXX2_TYPE_C_MODULE, PXX2_TYPE_ID_REGISTER);
 
@@ -120,23 +120,22 @@ bool Pxx2Pulses::setupRegisterFrame(uint8_t module)
   else {
     Pxx2Transport::addByte(0);
   }
-
-  return true; // TODO not always
 }
 
-bool Pxx2Pulses::setupBindFrame(uint8_t module)
+void Pxx2Pulses::setupBindFrame(uint8_t module)
 {
-  addFrameType(PXX2_TYPE_C_MODULE, PXX2_TYPE_ID_BIND);
-
   if (reusableBuffer.moduleSetup.pxx2.bindStep == BIND_WAIT) {
     if (get_tmr10ms() > reusableBuffer.moduleSetup.pxx2.bindWaitTimeout) {
       moduleSettings[module].mode = MODULE_MODE_NORMAL;
       reusableBuffer.moduleSetup.pxx2.bindStep = BIND_OK;
       POPUP_INFORMATION(STR_BIND_OK);
     }
-    return false;
+    return;
   }
-  else if (reusableBuffer.moduleSetup.pxx2.bindStep == BIND_RX_NAME_SELECTED) {
+
+  addFrameType(PXX2_TYPE_C_MODULE, PXX2_TYPE_ID_BIND);
+
+  if (reusableBuffer.moduleSetup.pxx2.bindStep == BIND_RX_NAME_SELECTED) {
     Pxx2Transport::addByte(0x01);
     for (uint8_t i=0; i<PXX2_LEN_RX_NAME; i++) {
       Pxx2Transport::addByte(reusableBuffer.moduleSetup.pxx2.bindCandidateReceiversNames[reusableBuffer.moduleSetup.pxx2.bindSelectedReceiverIndex][i]);
@@ -150,15 +149,13 @@ bool Pxx2Pulses::setupBindFrame(uint8_t module)
       Pxx2Transport::addByte(zchar2char(g_model.modelRegistrationID[i]));
     }
   }
-
-  return true; // TODO not always
 }
 
-bool Pxx2Pulses::setupSpectrumAnalyser(uint8_t module)
+void Pxx2Pulses::setupSpectrumAnalyser(uint8_t module)
 {
   if (moduleSettings[module].counter > 1000) {
     moduleSettings[module].counter = 1002;
-    return false;
+    return;
   }
 
   moduleSettings[module].counter = 1002;
@@ -174,11 +171,9 @@ bool Pxx2Pulses::setupSpectrumAnalyser(uint8_t module)
 
   reusableBuffer.spectrum.step = 100000;  // 100KHz
   Pxx2Transport::addWord(reusableBuffer.spectrum.step);
-
-  return true;
 }
 
-bool Pxx2Pulses::setupShareMode(uint8_t module)
+void Pxx2Pulses::setupShareMode(uint8_t module)
 {
   addFrameType(PXX2_TYPE_C_MODULE, PXX2_TYPE_ID_RX_SETUP);
 
@@ -191,24 +186,22 @@ bool Pxx2Pulses::setupShareMode(uint8_t module)
   }
 
   moduleSettings[module].mode = MODULE_MODE_NORMAL;
-  return true;
 }
 
-bool Pxx2Pulses::setupFrame(uint8_t module)
+void Pxx2Pulses::setupFrame(uint8_t module)
 {
   initFrame();
 
-  bool result = true;
   uint8_t mode = moduleSettings[module].mode;
 
   if (mode == MODULE_MODE_REGISTER)
-    result = setupRegisterFrame(module);
+    setupRegisterFrame(module);
   else if (mode == MODULE_MODE_BIND)
-    result = setupBindFrame(module);
+    setupBindFrame(module);
   else if (mode == MODULE_MODE_SPECTRUM_ANALYSER)
-    result = setupSpectrumAnalyser(module);
+    setupSpectrumAnalyser(module);
   else if (mode == MODULE_MODE_SHARE)
-    result = setupShareMode(module);
+    setupShareMode(module);
   else
     setupChannelsFrame(module);
 
@@ -217,8 +210,6 @@ bool Pxx2Pulses::setupFrame(uint8_t module)
   }
 
   endFrame();
-
-  return result;
 }
 
 template class PxxPulses<Pxx2Transport>;
diff --git a/radio/src/pulses/pxx2.h b/radio/src/pulses/pxx2.h
index 94d2ed885..117dddbfe 100644
--- a/radio/src/pulses/pxx2.h
+++ b/radio/src/pulses/pxx2.h
@@ -100,18 +100,18 @@ class Pxx2Transport: public DataBuffer<uint8_t, 64>, public Pxx2CrcMixin {
 
 class Pxx2Pulses: public PxxPulses<Pxx2Transport> {
   public:
-    bool setupFrame(uint8_t module);
+    void setupFrame(uint8_t module);
 
   protected:
-    bool setupRegisterFrame(uint8_t module);
+    void setupRegisterFrame(uint8_t module);
 
-    bool setupBindFrame(uint8_t module);
+    void setupBindFrame(uint8_t module);
 
-    bool setupShareMode(uint8_t module);
+    void setupShareMode(uint8_t module);
 
     void setupChannelsFrame(uint8_t module);
 
-    bool setupSpectrumAnalyser(uint8_t module);
+    void setupSpectrumAnalyser(uint8_t module);
 
     void addHead()
     {
@@ -157,11 +157,18 @@ class Pxx2Pulses: public PxxPulses<Pxx2Transport> {
 
     void endFrame()
     {
-      // update the frame LEN = frame length minus the 2 first bytes
-      data[1] = getSize() - 2;
+      uint8_t size = getSize() - 2;
 
-      // now add the CRC
-      addCrc();
+      if (size > 0) {
+        // update the frame LEN = frame length minus the 2 first bytes
+        data[1] = getSize() - 2;
+
+        // now add the CRC
+        addCrc();
+      }
+      else {
+        Pxx2Transport::initBuffer();
+      }
     }
 };
 
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 30fcfda33..3cfdb2377 100755
--- a/radio/src/targets/common/arm/stm32/intmodule_serial_driver.cpp
+++ b/radio/src/targets/common/arm/stm32/intmodule_serial_driver.cpp
@@ -92,6 +92,9 @@ extern "C" void INTMODULE_USART_IRQHandler(void)
 
 void intmoduleSendBuffer(const uint8_t * data, uint8_t size)
 {
+  if (size == 0)
+    return;
+
   DMA_InitTypeDef DMA_InitStructure;
   DMA_DeInit(INTMODULE_DMA_STREAM);
   DMA_InitStructure.DMA_Channel = INTMODULE_DMA_CHANNEL;
diff --git a/radio/src/telemetry/telemetry.cpp b/radio/src/telemetry/telemetry.cpp
index 2051be581..459a582b4 100644
--- a/radio/src/telemetry/telemetry.cpp
+++ b/radio/src/telemetry/telemetry.cpp
@@ -123,7 +123,7 @@ void processBindFrame(uint8_t module, uint8_t * frame)
 
 void processTelemetryFrame(uint8_t module, uint8_t * frame)
 {
-  sportProcessTelemetryPacketWithoutCrc(&frame[3]);
+  sportProcessTelemetryPacketWithoutCrc(&frame[2]);
 }
 
 void processSpectrumFrame(uint8_t module, uint8_t * frame)