diff --git a/libraries/AP_HAL_ChibiOS/hwdef/MambaF405-2022/defaults.parm b/libraries/AP_HAL_ChibiOS/hwdef/MambaF405-2022/defaults.parm
new file mode 100644
index 0000000000..9197bfd3fe
--- /dev/null
+++ b/libraries/AP_HAL_ChibiOS/hwdef/MambaF405-2022/defaults.parm
@@ -0,0 +1,5 @@
+# setup for LEDs on chan9
+SERVO7_FUNCTION 120
+NTF_LED_TYPES 257
+# Default VTX power to on
+RELAY_DEFAULT 1
\ No newline at end of file
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/MambaF405-2022/hwdef-bl.dat b/libraries/AP_HAL_ChibiOS/hwdef/MambaF405-2022/hwdef-bl.dat
index 7768209dbd..9749cd73ee 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/MambaF405-2022/hwdef-bl.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/MambaF405-2022/hwdef-bl.dat
@@ -1 +1,3 @@
 include ../MambaF405US-I2C/hwdef-bl.dat
+
+PC5 VTX_PWR OUTPUT HIGH
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/MambaF405-2022/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/MambaF405-2022/hwdef.dat
index 0e64b354a5..18910e045c 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/MambaF405-2022/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/MambaF405-2022/hwdef.dat
@@ -2,7 +2,7 @@
 
 include ../MambaF405US-I2C/hwdef.dat
 
-undef PA9 PA8 PC9 PC8 PB3 PB11
+undef PA9 PA8 PC9 PC8 PB3 PB11 PC5
 
 PA9 TIM1_CH2 TIM1 PWM(1) GPIO(50) BIDIR
 PA8 TIM1_CH1 TIM1 PWM(2) GPIO(51)
@@ -14,6 +14,10 @@ PB1 TIM3_CH4 TIM3 PWM(6) GPIO(55)
 # LED strip
 PB3 TIM2_CH2 TIM2 PWM(7) GPIO(56)
 
+# VTX Power control - should be high at startup to ensure power
+PC5 VTX_PWR OUTPUT HIGH GPIO(81)
+define RELAY2_PIN_DEFAULT 81
+
 PB11 USART3_RX USART3 NODMA
 
 # MambaF405-2022B board