diff --git a/boards/ark/fmu-v6x/extras/ark_fmu-v6x_bootloader.bin b/boards/ark/fmu-v6x/extras/ark_fmu-v6x_bootloader.bin
index bbe99d9659..f4ec9666cc 100755
Binary files a/boards/ark/fmu-v6x/extras/ark_fmu-v6x_bootloader.bin and b/boards/ark/fmu-v6x/extras/ark_fmu-v6x_bootloader.bin differ
diff --git a/boards/ark/fmu-v6x/nuttx-config/bootloader/defconfig b/boards/ark/fmu-v6x/nuttx-config/bootloader/defconfig
index 8dacdfb03e..c414af3c28 100644
--- a/boards/ark/fmu-v6x/nuttx-config/bootloader/defconfig
+++ b/boards/ark/fmu-v6x/nuttx-config/bootloader/defconfig
@@ -7,6 +7,7 @@
 #
 # CONFIG_DEV_CONSOLE is not set
 # CONFIG_DISABLE_PSEUDOFS_OPERATIONS is not set
+# CONFIG_DISABLE_PTHREAD is not set
 # CONFIG_SPI_EXCHANGE is not set
 # CONFIG_STM32H7_SYSCFG is not set
 CONFIG_ARCH="arm"
@@ -55,6 +56,7 @@ CONFIG_LIBC_STRERROR=y
 CONFIG_MEMSET_64BIT=y
 CONFIG_MEMSET_OPTSPEED=y
 CONFIG_PREALLOC_TIMERS=50
+CONFIG_PTHREAD_MUTEX_ROBUST=y
 CONFIG_PTHREAD_STACK_MIN=512
 CONFIG_RAM_SIZE=245760
 CONFIG_RAM_START=0x20010000
diff --git a/boards/ark/fmu-v6x/nuttx-config/include/board.h b/boards/ark/fmu-v6x/nuttx-config/include/board.h
index b29b8fc686..333c20905d 100644
--- a/boards/ark/fmu-v6x/nuttx-config/include/board.h
+++ b/boards/ark/fmu-v6x/nuttx-config/include/board.h
@@ -387,7 +387,7 @@
 
 #define GPIO_UART7_RX    GPIO_UART7_RX_4    /* PF6  */
 #define GPIO_UART7_TX    GPIO_UART7_TX_3    /* PE8  */
-#define GPIO_UART7_RTS   (GPIO_UART7_RTS_2 | GPIO_PULLDOWN)   /* PF8  */
+#define GPIO_UART7_RTS   GPIO_UART7_RTS_2   /* PF8  */
 #define GPIO_UART7_CTS   (GPIO_UART7_CTS_1 | GPIO_PULLDOWN)   /* PE10 */
 
 #define GPIO_UART8_RX    GPIO_UART8_RX_1    /* PE0 */
diff --git a/boards/ark/fmu-v6x/nuttx-config/nsh/defconfig b/boards/ark/fmu-v6x/nuttx-config/nsh/defconfig
index dba6395322..81a4dce6c5 100644
--- a/boards/ark/fmu-v6x/nuttx-config/nsh/defconfig
+++ b/boards/ark/fmu-v6x/nuttx-config/nsh/defconfig
@@ -291,8 +291,9 @@ CONFIG_UART4_RXBUFSIZE=600
 CONFIG_UART4_TXBUFSIZE=1500
 CONFIG_UART5_IFLOWCONTROL=y
 CONFIG_UART5_OFLOWCONTROL=y
+CONFIG_UART7_RXBUFSIZE=1500
 CONFIG_UART5_RXDMA=y
-CONFIG_UART5_TXBUFSIZE=3000
+CONFIG_UART5_TXBUFSIZE=10000
 CONFIG_UART5_TXDMA=y
 CONFIG_UART7_BAUD=57600
 CONFIG_UART7_IFLOWCONTROL=y