diff --git a/latest/Firmware/Inc/LEDManager.hpp b/latest/Firmware/Inc/LEDManager.hpp
index 1f144d7..095c10c 100644
--- a/latest/Firmware/Inc/LEDManager.hpp
+++ b/latest/Firmware/Inc/LEDManager.hpp
@@ -32,7 +32,7 @@ public:
 
 private:
   LEDManager();
-  bool mForceTXLedOff = false;
+  volatile bool mForceTXLedOff = false;
 };
 
 
diff --git a/latest/Firmware/Src/LEDManager.cpp b/latest/Firmware/Src/LEDManager.cpp
index 74a2c95..f101597 100644
--- a/latest/Firmware/Src/LEDManager.cpp
+++ b/latest/Firmware/Src/LEDManager.cpp
@@ -39,7 +39,6 @@ void tickCB()
 
 void LEDManager::init()
 {
-  bsp_set_tick_callback(tickCB);
   if ( !Configuration::instance().isStationDataProvisioned() )
     {
       mForceTXLedOff = true;
@@ -47,6 +46,7 @@ void LEDManager::init()
       // This call actually has the opposite effect as it will cause the TX led to be pulled to GND
       bsp_tx_led_on();
     }
+  bsp_set_tick_callback(tickCB);
 }
 
 void LEDManager::onTick()
@@ -64,7 +64,6 @@ void LEDManager::onTick()
       count2 = 1;
       bsp_tx_led_off();
     }
-
 }
 
 
diff --git a/latest/Firmware/Src/NoiseFloorDetector.cpp b/latest/Firmware/Src/NoiseFloorDetector.cpp
index fdca105..2caa74e 100644
--- a/latest/Firmware/Src/NoiseFloorDetector.cpp
+++ b/latest/Firmware/Src/NoiseFloorDetector.cpp
@@ -49,6 +49,8 @@ void NoiseFloorDetector::report(char channel, uint8_t rssi)
 {
 #if BOARD_REV == 61 or BOARD_REV == 52
   if ( rssi < 0x12 ) // Not realistic, likely a bug
+#elif BOARD_REV == 109
+    if ( rssi < 0x24 )
 #else
   if ( rssi < 0x32 ) // Not realistic, likely a bug
 #endif
diff --git a/latest/Firmware/Src/bsp/bsp_10_9.cpp b/latest/Firmware/Src/bsp/bsp_10_9.cpp
index 9c47a47..d92262f 100644
--- a/latest/Firmware/Src/bsp/bsp_10_9.cpp
+++ b/latest/Firmware/Src/bsp/bsp_10_9.cpp
@@ -501,7 +501,7 @@ uint8_t bsp_tx_spi_byte(uint8_t data)
   HAL_SPI_TransmitReceive(&hspi1, &data, &result, 1, 2);
   return result;
 }
-
+#if 0
 bool bsp_erase_station_data()
 {
   return false;
@@ -511,16 +511,20 @@ bool bsp_save_station_data(const StationData &data)
 {
   return false;
 }
+#endif
 
 void bsp_reboot()
 {
   NVIC_SystemReset();
 }
 
+#if 0
 bool bsp_read_station_data(StationData &data)
 {
   return false;
 }
+#endif
+
 
 bool bsp_is_tx_disabled()
 {
@@ -545,10 +549,12 @@ void bsp_signal_rx_event()
   HAL_GPIO_WritePin(RX_EVT_PORT, RX_EVT_PIN, GPIO_PIN_SET);
 }
 
+#if 0
 void bsp_signal_tx_event()
 {
   HAL_GPIO_WritePin(TX_EVT_PORT, TX_EVT_PIN, GPIO_PIN_SET);
 }
+#endif
 
 void bsp_signal_gps_status(bool tracking)
 {
@@ -626,13 +632,8 @@ extern "C"
 
   void HAL_SYSTICK_Callback()
   {
-    static int count = 1;
-    if ( count++ % 20 == 0 )
-      {
-        count = 1;
-        HAL_GPIO_WritePin(RX_EVT_PORT, RX_EVT_PIN, GPIO_PIN_RESET);
-        HAL_GPIO_WritePin(TX_EVT_PORT, TX_EVT_PIN, GPIO_PIN_RESET);
-      }
+    if ( tickCallback )
+      tickCallback();
   }
 
 }
diff --git a/latest/Firmware/Src/main.cpp b/latest/Firmware/Src/main.cpp
index a7feb97..d604d78 100644
--- a/latest/Firmware/Src/main.cpp
+++ b/latest/Firmware/Src/main.cpp
@@ -17,7 +17,6 @@
   along with this program.  If not, see <https://www.gnu.org/licenses/>
  */
 
-#include "stm32l4xx_hal.h"
 #include "config.h"
 #include "RadioManager.hpp"
 #include "RXPacketProcessor.hpp"
@@ -25,10 +24,8 @@
 #include "TXScheduler.hpp"
 #include "GPS.hpp"
 #include "LEDManager.hpp"
-#include "SystickTimer.hpp"
 #include "CommandProcessor.hpp"
 #include "bsp.hpp"
-#include "printf_serial.h"
 
 
 void jump_to_bootloader()