diff --git a/libraries/AP_HAL_ChibiOS/hwdef/MicoAir405v2/README.md b/libraries/AP_HAL_ChibiOS/hwdef/MicoAir405v2/README.md
index 2ac367cb97..2cdf23d83c 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/MicoAir405v2/README.md
+++ b/libraries/AP_HAL_ChibiOS/hwdef/MicoAir405v2/README.md
@@ -26,11 +26,11 @@ The MicoAir405v2 is a flight controller produced by [MicoAir](http://micoair.com
 
  - SERIAL0 -> USB
  - SERIAL1 -> UART1 (DMA-enabled)
- - SERIAL2 -> UART2 (DJI - VTX, DMA-enabled) 
+ - SERIAL2 -> UART2 (DJI - VTX, TX only is DMA Enabled)
  - SERIAL3 -> UART3 (GPS)
- - SERIAL4 -> UART4 (DMA-enabled)
+ - SERIAL4 -> UART4 (TX only is DMA Enabled)
  - SERIAL5 -> UART5 (ESC Telemetry)
- - SERIAL6 -> UART6 (RX6 is inverted from SBUS pin, no DMA on TX6)
+ - SERIAL6 -> UART6 (RX6 is inverted from SBUS pin, RX only is DMA Enabled)
 
 ## RC Input
 
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/MicoAir405v2/defaults.parm b/libraries/AP_HAL_ChibiOS/hwdef/MicoAir405v2/defaults.parm
index dbb287f7b6..9f3a294361 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/MicoAir405v2/defaults.parm
+++ b/libraries/AP_HAL_ChibiOS/hwdef/MicoAir405v2/defaults.parm
@@ -8,3 +8,4 @@ SERIAL3_PROTOCOL 5
 SERIAL4_PROTOCOL 2
 SERIAL5_PROTOCOL 16
 SERIAL6_PROTOCOL 23
+GPS_DRV_OPTIONS 4
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/MicoAir405v2/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/MicoAir405v2/hwdef.dat
index fd73218c66..7ee7100f64 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/MicoAir405v2/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/MicoAir405v2/hwdef.dat
@@ -28,9 +28,9 @@ PA8 LED_BLUE OUTPUT LOW GPIO(0)
 PC4 LED_GREEN OUTPUT LOW GPIO(1)
 PC5 LED_RED OUTPUT LOW GPIO(2)
 
-define HAL_GPIO_A_LED_PIN 0
-define HAL_GPIO_B_LED_PIN 2
-define HAL_GPIO_C_LED_PIN 1
+define HAL_GPIO_A_LED_PIN 2
+define HAL_GPIO_B_LED_PIN 1
+define HAL_GPIO_C_LED_PIN 0
 
 define HAL_HAVE_PIXRACER_LED
 
@@ -90,18 +90,18 @@ PA10 USART1_RX USART1
 
 # USART2
 PA2 USART2_TX USART2
-PA3 USART2_RX USART2
+PA3 USART2_RX USART2 NODMA
 
 # USART3
 PB10 USART3_TX USART3 NODMA
-PB11 USART3_RX USART3
+PB11 USART3_RX USART3 NODMA
 
 # UART4
 PA0 UART4_TX UART4
-PA1 UART4_RX UART4
+PA1 UART4_RX UART4 NODMA
 
 # UART5
-PD2 UART5_RX UART5
+PD2 UART5_RX UART5 NODMA
 
 # UART6
 PC7 USART6_RX USART6
@@ -111,8 +111,8 @@ PC15 SBUS_INV OUTPUT
 # 10 PWM available by default
 define BOARD_PWM_COUNT_DEFAULT 10
 
-PB0  TIM3_CH3  TIM3  PWM(1)  GPIO(50) BIDIR
-PB1  TIM3_CH4  TIM3  PWM(2)  GPIO(51)
+PB0  TIM3_CH3  TIM3  PWM(1)  GPIO(50)
+PB1  TIM3_CH4  TIM3  PWM(2)  GPIO(51) BIDIR
 PA15 TIM2_CH1  TIM2  PWM(3)  GPIO(52) BIDIR
 PB3  TIM2_CH2  TIM2  PWM(4)  GPIO(53)
 PB4  TIM3_CH1  TIM3  PWM(5)  GPIO(54)