diff --git a/src/main/drivers/dma_reqmap.c b/src/main/drivers/dma_reqmap.c
index 6e53a61a28..4be6b587c8 100644
--- a/src/main/drivers/dma_reqmap.c
+++ b/src/main/drivers/dma_reqmap.c
@@ -68,8 +68,8 @@ typedef struct dmaTimerMapping_s {
 #define DMA_REQUEST_UART2_TX DMA_REQUEST_USART2_TX
 #define DMA_REQUEST_UART3_RX DMA_REQUEST_USART3_RX
 #define DMA_REQUEST_UART3_TX DMA_REQUEST_USART3_TX
-#define DMA_REQUEST_UART6_RX DMA_REQUEST_LPUART1_RX
-#define DMA_REQUEST_UART6_TX DMA_REQUEST_LPUART1_TX
+#define DMA_REQUEST_UART9_RX DMA_REQUEST_LPUART1_RX
+#define DMA_REQUEST_UART9_TX DMA_REQUEST_LPUART1_TX
 
 static const dmaPeripheralMapping_t dmaPeripheralMapping[] = {
 #ifdef USE_SPI
@@ -102,8 +102,8 @@ static const dmaPeripheralMapping_t dmaPeripheralMapping[] = {
     REQMAP_DIR(UART, 4, RX),
     REQMAP_DIR(UART, 5, TX),
     REQMAP_DIR(UART, 5, RX),
-    REQMAP_DIR(UART, 6, TX),
-    REQMAP_DIR(UART, 6, RX),
+    REQMAP_DIR(UART, 9, TX),
+    REQMAP_DIR(UART, 9, RX),
 #endif
 
 #ifdef USE_TIMER
diff --git a/src/main/drivers/serial_pinconfig.c b/src/main/drivers/serial_pinconfig.c
index fadd6c3c8c..2d7c5f42c6 100644
--- a/src/main/drivers/serial_pinconfig.c
+++ b/src/main/drivers/serial_pinconfig.c
@@ -205,6 +205,18 @@
 # endif
 #endif
 
+#ifdef USE_UART9
+# if !defined(UART9_RX_PIN)
+#  define UART9_RX_PIN NONE
+# endif
+# if !defined(UART9_TX_PIN)
+#  define UART9_TX_PIN NONE
+# endif
+# if !defined(INVERTER_PIN_UART9)
+#  define INVERTER_PIN_UART9 NONE
+# endif
+#endif
+
 #ifdef USE_SOFTSERIAL1
 # if !defined(SOFTSERIAL1_RX_PIN)
 #  define SOFTSERIAL1_RX_PIN NONE
@@ -254,6 +266,9 @@ static const serialDefaultPin_t serialDefaultPin[] = {
 #ifdef USE_UART8
     { SERIAL_PORT_USART8, IO_TAG(UART8_RX_PIN), IO_TAG(UART8_TX_PIN), IO_TAG(INVERTER_PIN_UART8) },
 #endif
+#ifdef USE_UART9
+    { SERIAL_PORT_LPUART1, IO_TAG(UART9_RX_PIN), IO_TAG(UART9_TX_PIN), IO_TAG(INVERTER_PIN_UART9) },
+#endif
 #ifdef USE_SOFTSERIAL1
     { SERIAL_PORT_SOFTSERIAL1, IO_TAG(SOFTSERIAL1_RX_PIN), IO_TAG(SOFTSERIAL1_TX_PIN), IO_TAG(NONE) },
 #endif
diff --git a/src/main/drivers/serial_uart.c b/src/main/drivers/serial_uart.c
index d02a100bc2..e516262c0c 100644
--- a/src/main/drivers/serial_uart.c
+++ b/src/main/drivers/serial_uart.c
@@ -97,6 +97,10 @@ UART_BUFFERS(7);
 UART_BUFFERS(8);
 #endif
 
+#ifdef USE_UART9
+UART_BUFFERS(9);
+#endif
+
 #undef UART_BUFFERS
 
 serialPort_t *uartOpen(UARTDevice_e device, serialReceiveCallbackPtr rxCallback, void *rxCallbackData, uint32_t baudRate, portMode_e mode, portOptions_e options)
@@ -370,12 +374,8 @@ UART_IRQHandler(UART, 5, 5)  // UART5 Rx/Tx IRQ Handler
 #endif
 
 #ifdef USE_UART6
-#ifdef STM32G4
-UART_IRQHandler(LPUART, 1, 6) // UART6 (implemented with LPUART1) Rx/Tx IRQ Handler
-#else
 UART_IRQHandler(USART, 6, 6) // USART6 Rx/Tx IRQ Handler
 #endif
-#endif
 
 #ifdef USE_UART7
 UART_IRQHandler(UART, 7, 7)  // UART7 Rx/Tx IRQ Handler
@@ -385,4 +385,8 @@ UART_IRQHandler(UART, 7, 7)  // UART7 Rx/Tx IRQ Handler
 UART_IRQHandler(UART, 8, 8)  // UART8 Rx/Tx IRQ Handler
 #endif
 
+#ifdef USE_UART9
+UART_IRQHandler(LPUART, 1, 9) // UART9 (implemented with LPUART1) Rx/Tx IRQ Handler
+#endif
+
 #endif // USE_UART
diff --git a/src/main/drivers/serial_uart.h b/src/main/drivers/serial_uart.h
index 7232ee062e..c00be4ab02 100644
--- a/src/main/drivers/serial_uart.h
+++ b/src/main/drivers/serial_uart.h
@@ -37,7 +37,8 @@ typedef enum {
     UARTDEV_5 = 4,
     UARTDEV_6 = 5,
     UARTDEV_7 = 6,
-    UARTDEV_8 = 7
+    UARTDEV_8 = 7,
+    UARTDEV_9 = 8,
 } UARTDevice_e;
 
 typedef struct uartPort_s {
diff --git a/src/main/drivers/serial_uart_impl.h b/src/main/drivers/serial_uart_impl.h
index fe72772615..bd11aa96b2 100644
--- a/src/main/drivers/serial_uart_impl.h
+++ b/src/main/drivers/serial_uart_impl.h
@@ -68,7 +68,7 @@
 #define UART_TX_BUFFER_SIZE     256
 #endif
 #elif defined(STM32G4)
-#define UARTDEV_COUNT_MAX 6
+#define UARTDEV_COUNT_MAX 9  // UART1~5 + UART9 (Implemented with LPUART1)
 #define UARTHARDWARE_MAX_PINS 3
 #ifndef UART_RX_BUFFER_SIZE
 #define UART_RX_BUFFER_SIZE     128
@@ -130,7 +130,13 @@
 #define UARTDEV_COUNT_8 0
 #endif
 
-#define UARTDEV_COUNT (UARTDEV_COUNT_1 + UARTDEV_COUNT_2 + UARTDEV_COUNT_3 + UARTDEV_COUNT_4 + UARTDEV_COUNT_5 + UARTDEV_COUNT_6 + UARTDEV_COUNT_7 + UARTDEV_COUNT_8)
+#ifdef USE_UART9
+#define UARTDEV_COUNT_9 1
+#else
+#define UARTDEV_COUNT_9 0
+#endif
+
+#define UARTDEV_COUNT (UARTDEV_COUNT_1 + UARTDEV_COUNT_2 + UARTDEV_COUNT_3 + UARTDEV_COUNT_4 + UARTDEV_COUNT_5 + UARTDEV_COUNT_6 + UARTDEV_COUNT_7 + UARTDEV_COUNT_8 + UARTDEV_COUNT_9)
 
 typedef struct uartPinDef_s {
     ioTag_t pin;
@@ -252,4 +258,8 @@ UART_BUFFERS_EXTERN(7);
 UART_BUFFERS_EXTERN(8);
 #endif
 
+#ifdef USE_UART9
+UART_BUFFERS_EXTERN(9);
+#endif
+
 #undef UART_BUFFERS_EXTERN
diff --git a/src/main/drivers/serial_uart_stm32g4xx.c b/src/main/drivers/serial_uart_stm32g4xx.c
index 76f31c9816..19186042b5 100644
--- a/src/main/drivers/serial_uart_stm32g4xx.c
+++ b/src/main/drivers/serial_uart_stm32g4xx.c
@@ -67,11 +67,11 @@
 #ifndef UART5_RX_DMA_CHANNEL
 #define UART5_RX_DMA_CHANNEL NULL
 #endif
-#ifndef UART6_TX_DMA_CHANNEL
-#define UART6_TX_DMA_CHANNEL NULL
+#ifndef UART9_TX_DMA_CHANNEL
+#define UART9_TX_DMA_CHANNEL NULL
 #endif
-#ifndef UART6_RX_DMA_CHANNEL
-#define UART6_RX_DMA_CHANNEL NULL
+#ifndef UART9_RX_DMA_CHANNEL
+#define UART9_RX_DMA_CHANNEL NULL
 #endif
 
 const uartHardware_t uartHardware[UARTDEV_COUNT] = {
@@ -222,16 +222,16 @@ const uartHardware_t uartHardware[UARTDEV_COUNT] = {
     },
 #endif
 
-#ifdef USE_UART6
-    // On G474, UART6 is implemented as LPUART1
+#ifdef USE_UART9
+    // On G474, UART9 is implemented as LPUART1
     {
-        .device = UARTDEV_6,
+        .device = UARTDEV_9,
         .reg = LPUART1,
 #ifdef USE_DMA
         .rxDMAChannel = DMA_REQUEST_LPUART1_RX,
-        .rxDMAResource = (dmaResource_t *)UART6_RX_DMA_CHANNEL,
+        .rxDMAResource = (dmaResource_t *)UART9_RX_DMA_CHANNEL,
         .txDMAChannel = DMA_REQUEST_LPUART1_TX,
-        .txDMAResource = (dmaResource_t *)UART6_TX_DMA_CHANNEL,
+        .txDMAResource = (dmaResource_t *)UART9_TX_DMA_CHANNEL,
 #endif
         .rxPins = {
             { DEFIO_TAG_E(PA3),  GPIO_AF12_LPUART1 },
@@ -247,10 +247,10 @@ const uartHardware_t uartHardware[UARTDEV_COUNT] = {
         .rxIrq = LPUART1_IRQn,
         .txPriority = NVIC_PRIO_SERIALUART6_TXDMA,
         .rxPriority = NVIC_PRIO_SERIALUART6,
-        .txBuffer = uart6TxBuffer,
-        .rxBuffer = uart6RxBuffer,
-        .txBufferSize = sizeof(uart6TxBuffer),
-        .rxBufferSize = sizeof(uart6RxBuffer),
+        .txBuffer = uart9TxBuffer,
+        .rxBuffer = uart9RxBuffer,
+        .txBufferSize = sizeof(uart9TxBuffer),
+        .rxBufferSize = sizeof(uart9RxBuffer),
     },
 #endif
 };
diff --git a/src/main/io/serial.c b/src/main/io/serial.c
index e016650b99..307a38d7f5 100644
--- a/src/main/io/serial.c
+++ b/src/main/io/serial.c
@@ -93,6 +93,9 @@ const serialPortIdentifier_e serialPortIdentifiers[SERIAL_PORT_COUNT] = {
 #ifdef USE_UART8
     SERIAL_PORT_USART8,
 #endif
+#ifdef USE_UART9
+    SERIAL_PORT_LPUART1,
+#endif
 #ifdef USE_SOFTSERIAL1
     SERIAL_PORT_SOFTSERIAL1,
 #endif
@@ -391,6 +394,9 @@ serialPort_t *openSerialPort(
 #ifdef USE_UART8
         case SERIAL_PORT_USART8:
 #endif
+#ifdef USE_UART9
+        case SERIAL_PORT_LPUART1:
+#endif
 #if defined(SIMULATOR_BUILD)
             // emulate serial ports over TCP
             serialPort = serTcpOpen(SERIAL_PORT_IDENTIFIER_TO_UARTDEV(identifier), rxCallback, rxCallbackData, baudRate, mode, options);
diff --git a/src/main/io/serial.h b/src/main/io/serial.h
index 8023e32ab9..e09b862cb8 100644
--- a/src/main/io/serial.h
+++ b/src/main/io/serial.h
@@ -87,6 +87,7 @@ typedef enum {
     SERIAL_PORT_USART6,
     SERIAL_PORT_USART7,
     SERIAL_PORT_USART8,
+    SERIAL_PORT_LPUART1,
     SERIAL_PORT_USB_VCP = 20,
     SERIAL_PORT_SOFTSERIAL1 = 30,
     SERIAL_PORT_SOFTSERIAL2,
@@ -95,7 +96,7 @@ typedef enum {
 
 extern const serialPortIdentifier_e serialPortIdentifiers[SERIAL_PORT_COUNT];
 
-#define SERIAL_PORT_IDENTIFIER_TO_INDEX(x) (((x) <= SERIAL_PORT_USART8) ? (x) : (RESOURCE_SOFT_OFFSET + ((x) - SERIAL_PORT_SOFTSERIAL1)))
+#define SERIAL_PORT_IDENTIFIER_TO_INDEX(x) (((x) < RESOURCE_SOFT_OFFSET) ? (x) : (RESOURCE_SOFT_OFFSET + ((x) - SERIAL_PORT_SOFTSERIAL1)))
 
 #define SERIAL_PORT_IDENTIFIER_TO_UARTDEV(x) ((x) - SERIAL_PORT_USART1 + UARTDEV_1)
 
diff --git a/src/main/pg/serial_uart.c b/src/main/pg/serial_uart.c
index e12368e7ee..78d21022b4 100644
--- a/src/main/pg/serial_uart.c
+++ b/src/main/pg/serial_uart.c
@@ -68,6 +68,9 @@ static uartDmaopt_t uartDmaopt[] = {
 #ifdef USE_UART8
     { UARTDEV_8, UART8_TX_DMA_OPT, UART8_RX_DMA_OPT },
 #endif
+#ifdef USE_UART9
+    { UARTDEV_9, UART9_TX_DMA_OPT, UART9_RX_DMA_OPT },
+#endif
 };
 
 void pgResetFn_serialUartConfig(serialUartConfig_t *config)
diff --git a/src/main/target/common_defaults_post.h b/src/main/target/common_defaults_post.h
index 965ade2274..df8db43040 100644
--- a/src/main/target/common_defaults_post.h
+++ b/src/main/target/common_defaults_post.h
@@ -638,6 +638,15 @@
 #endif
 #endif
 
+#ifdef USE_UART9
+#ifndef UART9_TX_DMA_OPT
+#define UART9_TX_DMA_OPT (DMA_OPT_UNUSED)
+#endif
+#ifndef UART9_RX_DMA_OPT
+#define UART9_RX_DMA_OPT (DMA_OPT_UNUSED)
+#endif
+#endif
+
 #ifndef RTC6705_CS_PIN
 #define RTC6705_CS_PIN NONE
 #endif