diff --git a/cmake/configs/nuttx_av-x-v1_default.cmake b/cmake/configs/nuttx_av-x-v1_default.cmake
index 8f9771a130..5b6942882c 100644
--- a/cmake/configs/nuttx_av-x-v1_default.cmake
+++ b/cmake/configs/nuttx_av-x-v1_default.cmake
@@ -4,9 +4,11 @@ px4_nuttx_configure(HWCLASS m7 CONFIG nsh ROMFS y ROMFSROOT px4fmu_common)
 # user-configurable UART ports
 set(board_serial_ports
 	GPS1:/dev/ttyS6
-	TEL1:/dev/ttyS1
-	TEL2:/dev/ttyS2
-	TEL4:/dev/ttyS3)
+	TEL1:/dev/ttyS0
+	TEL2:/dev/ttyS1
+	TEL3:/dev/ttyS2
+	TEL4:/dev/ttyS3
+	)
 
 set(config_uavcan_num_ifaces 1)
 
diff --git a/platforms/nuttx/nuttx-configs/av-x-v1/nsh/defconfig b/platforms/nuttx/nuttx-configs/av-x-v1/nsh/defconfig
index 16cc0c55b3..480d450895 100644
--- a/platforms/nuttx/nuttx-configs/av-x-v1/nsh/defconfig
+++ b/platforms/nuttx/nuttx-configs/av-x-v1/nsh/defconfig
@@ -384,7 +384,7 @@ CONFIG_STM32F7_WWDG=y
 CONFIG_STM32F7_SERIAL_RXDMA_BUFFER_SIZE=32
 CONFIG_STM32F7_USART_BREAKS=y
 CONFIG_STM32F7_SERIALBRK_BSDCOMPAT=y
-CONFIG_STM32F7_USART_SINGLEWIRE=y
+# CONFIG_STM32F7_USART_SINGLEWIRE is not set
 
 #
 # SPI Configuration
diff --git a/src/drivers/boards/av-x-v1/board_config.h b/src/drivers/boards/av-x-v1/board_config.h
index 41f7da2691..75ad3c569c 100644
--- a/src/drivers/boards/av-x-v1/board_config.h
+++ b/src/drivers/boards/av-x-v1/board_config.h
@@ -316,9 +316,9 @@
 
 #define RC_UXART_BASE                      STM32_UART5_BASE
 #define RC_SERIAL_PORT                     "/dev/ttyS4"
-#define BOARD_HAS_SINGLE_WIRE              1 /* HW is capable of Single Wire */
-#define BOARD_HAS_SINGLE_WIRE_ON_TX        1 /* HW default is wired as Single Wire On TX pin */
-#define BOARD_HAS_RX_TX_SWAP               1 /* HW Can swap TX and RX */
+#define BOARD_HAS_SINGLE_WIRE              0 /* HW is capable of Single Wire */
+#define BOARD_HAS_SINGLE_WIRE_ON_TX        0 /* HW default is wired as Single Wire On TX pin */
+#define BOARD_HAS_RX_TX_SWAP               0 /* HW Can swap TX and RX */
 #define RC_SERIAL_PORT_IS_SWAPED           0 /* Board wired with RC's TX is on cpu RX */
 
 /* Power switch controls ******************************************************/