diff --git a/boards/cubepilot/cubeorange/nuttx-config/include/board.h b/boards/cubepilot/cubeorange/nuttx-config/include/board.h
index 5827b1bc81d..62605f98d13 100644
--- a/boards/cubepilot/cubeorange/nuttx-config/include/board.h
+++ b/boards/cubepilot/cubeorange/nuttx-config/include/board.h
@@ -194,6 +194,12 @@
 
 #define STM32_RCC_D3CCIPR_ADCSRC     RCC_D3CCIPR_ADCSEL_PLL2     /* ADC 1 2 3 clock source */
 
+/* UART clock selection */
+/* reset to default to overwrite any changes done by any bootloader */
+
+#define STM32_RCC_D2CCIP2R_USART234578_SEL RCC_D2CCIP2R_USART234578SEL_RCC
+#define STM32_RCC_D2CCIP2R_USART16_SEL     RCC_D2CCIP2R_USART16SEL_RCC
+
 /* FLASH wait states */
 #define BOARD_FLASH_WAITSTATES 2
 
diff --git a/boards/cubepilot/cubeorangeplus/nuttx-config/include/board.h b/boards/cubepilot/cubeorangeplus/nuttx-config/include/board.h
index d650c616911..babaf587e45 100644
--- a/boards/cubepilot/cubeorangeplus/nuttx-config/include/board.h
+++ b/boards/cubepilot/cubeorangeplus/nuttx-config/include/board.h
@@ -195,6 +195,12 @@
 
 #define STM32_RCC_D3CCIPR_ADCSRC     RCC_D3CCIPR_ADCSEL_PLL2     /* ADC 1 2 3 clock source */
 
+/* UART clock selection */
+/* reset to default to overwrite any changes done by any bootloader */
+
+#define STM32_RCC_D2CCIP2R_USART234578_SEL RCC_D2CCIP2R_USART234578SEL_RCC
+#define STM32_RCC_D2CCIP2R_USART16_SEL     RCC_D2CCIP2R_USART16SEL_RCC
+
 /* FLASH wait states */
 #define BOARD_FLASH_WAITSTATES 2
 
diff --git a/boards/px4/fmu-v6c/nuttx-config/include/board.h b/boards/px4/fmu-v6c/nuttx-config/include/board.h
index 1951031cb82..4b4b128cf2b 100644
--- a/boards/px4/fmu-v6c/nuttx-config/include/board.h
+++ b/boards/px4/fmu-v6c/nuttx-config/include/board.h
@@ -246,6 +246,12 @@
 
 #define STM32_RCC_D2CCIP2R_USBSRC    RCC_D2CCIP2R_USBSEL_PLL3
 
+/* UART clock selection */
+/* reset to default to overwrite any changes done by any bootloader */
+
+#define STM32_RCC_D2CCIP2R_USART234578_SEL RCC_D2CCIP2R_USART234578SEL_RCC
+#define STM32_RCC_D2CCIP2R_USART16_SEL     RCC_D2CCIP2R_USART16SEL_RCC
+
 /* ADC 1 2 3 clock source */
 
 #define STM32_RCC_D3CCIPR_ADCSRC     RCC_D3CCIPR_ADCSEL_PLL2
diff --git a/boards/px4/fmu-v6x/nuttx-config/include/board.h b/boards/px4/fmu-v6x/nuttx-config/include/board.h
index d6b2925b795..7907eafad19 100644
--- a/boards/px4/fmu-v6x/nuttx-config/include/board.h
+++ b/boards/px4/fmu-v6x/nuttx-config/include/board.h
@@ -250,6 +250,12 @@
 
 #define STM32_RCC_D3CCIPR_ADCSRC     RCC_D3CCIPR_ADCSEL_PLL2
 
+/* UART clock selection */
+/* reset to default to overwrite any changes done by any bootloader */
+
+#define STM32_RCC_D2CCIP2R_USART234578_SEL RCC_D2CCIP2R_USART234578SEL_RCC
+#define STM32_RCC_D2CCIP2R_USART16_SEL     RCC_D2CCIP2R_USART16SEL_RCC
+
 /* FDCAN 1 2 clock source */
 
 #define STM32_RCC_D2CCIP1R_FDCANSEL  RCC_D2CCIP1R_FDCANSEL_HSE   /* FDCAN 1 2 clock source */
diff --git a/platforms/nuttx/NuttX/nuttx b/platforms/nuttx/NuttX/nuttx
index d3b85f3e545..5d74bc13895 160000
--- a/platforms/nuttx/NuttX/nuttx
+++ b/platforms/nuttx/NuttX/nuttx
@@ -1 +1 @@
-Subproject commit d3b85f3e545de3692c100143f4a9ae67762ce679
+Subproject commit 5d74bc138955e6f010a38e0f87f34e9a9019aecc