diff --git a/Tools/IO_Firmware/iofirmware_highpolh.bin b/Tools/IO_Firmware/iofirmware_highpolh.bin
index 861b9fd6154..7f769c46ceb 100755
Binary files a/Tools/IO_Firmware/iofirmware_highpolh.bin and b/Tools/IO_Firmware/iofirmware_highpolh.bin differ
diff --git a/Tools/IO_Firmware/iofirmware_lowpolh.bin b/Tools/IO_Firmware/iofirmware_lowpolh.bin
index 7599e9265bd..857e87f26ec 100755
Binary files a/Tools/IO_Firmware/iofirmware_lowpolh.bin and b/Tools/IO_Firmware/iofirmware_lowpolh.bin differ
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/iomcu/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/iomcu/hwdef.dat
index fc1b70a2e19..ffbb9dbbd78 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/iomcu/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/iomcu/hwdef.dat
@@ -119,6 +119,7 @@ define PORT_INT_REQUIRED_STACK 64
 define HAL_NO_TIMER_THREAD
 define HAL_NO_RCIN_THREAD
 define HAL_NO_MONITOR_THREAD
+define HAL_NO_RCOUT_THREAD
 
 #defined to turn off undef warnings
 define __FPU_PRESENT 0