diff --git a/cores/arduino/HardwareSerial.cpp b/cores/arduino/HardwareSerial.cpp
index 6fba901..f8e5b4b 100644
--- a/cores/arduino/HardwareSerial.cpp
+++ b/cores/arduino/HardwareSerial.cpp
@@ -150,6 +150,30 @@ void HardwareSerial::begin(
         crm_periph_clock_enable(CRM_GPIOB_PERIPH_CLOCK, TRUE);
         crm_periph_clock_enable(CRM_USART3_PERIPH_CLOCK, TRUE);
     }
+    else if(_USARTx == UART4)
+    {
+        GPIOx = GPIOA;
+        Tx_Pin = GPIO_Pin_0;
+        Rx_Pin = GPIO_Pin_1;
+        USARTx_IRQn = UART4_IRQn;
+
+        crm_periph_clock_enable(CRM_GPIOA_PERIPH_CLOCK, TRUE);
+        crm_periph_clock_enable(CRM_UART4_PERIPH_CLOCK, TRUE);
+        crm_periph_clock_enable(CRM_IOMUX_PERIPH_CLOCK,TRUE);
+        gpio_pin_remap_config(UART4_GMUX_0010, TRUE);
+    }
+    else if(_USARTx == UART5)
+    {
+        GPIOx = GPIOB;
+        Tx_Pin = GPIO_Pin_9;
+        Rx_Pin = GPIO_Pin_8;
+        USARTx_IRQn = UART5_IRQn;
+
+        crm_periph_clock_enable(CRM_GPIOB_PERIPH_CLOCK, TRUE);
+        crm_periph_clock_enable(CRM_UART5_PERIPH_CLOCK, TRUE);
+        crm_periph_clock_enable(CRM_IOMUX_PERIPH_CLOCK,TRUE);
+        gpio_pin_remap_config(UART5_GMUX_0001, TRUE);
+    }
     else
     {
         return;
@@ -290,3 +314,21 @@ extern "C" SERIAL_3_IRQ_HANDLER_DEF()
     Serial3.IRQHandler();
 }
 #endif
+
+#if SERIAL_4_ENABLE
+HardwareSerial Serial4(SERIAL_4_UART);
+
+extern "C" SERIAL_4_IRQ_HANDLER_DEF()
+{
+    Serial4.IRQHandler();
+}
+#endif
+
+#if SERIAL_5_ENABLE
+HardwareSerial Serial5(SERIAL_5_UART);
+
+extern "C" SERIAL_5_IRQ_HANDLER_DEF()
+{
+    Serial5.IRQHandler();
+}
+#endif
diff --git a/cores/arduino/HardwareSerial.h b/cores/arduino/HardwareSerial.h
index a4c447c..59f0584 100644
--- a/cores/arduino/HardwareSerial.h
+++ b/cores/arduino/HardwareSerial.h
@@ -126,4 +126,12 @@ extern HardwareSerial Serial2;
 extern HardwareSerial Serial3;
 #endif
 
+#if SERIAL_4_ENABLE
+extern HardwareSerial Serial4;
+#endif
+
+#if SERIAL_5_ENABLE
+extern HardwareSerial Serial5;
+#endif
+
 #endif
diff --git a/cores/arduino/libcore/config/mcu_config.h b/cores/arduino/libcore/config/mcu_config.h
index e0e5d49..b7016cb 100644
--- a/cores/arduino/libcore/config/mcu_config.h
+++ b/cores/arduino/libcore/config/mcu_config.h
@@ -54,6 +54,18 @@
 #  define SERIAL_3_IRQ_HANDLER_DEF()        void USART3_IRQHandler(void)
 #endif
 
+#define SERIAL_4_ENABLE                     1
+#if SERIAL_4_ENABLE
+#  define SERIAL_4_UART                    UART4
+#  define SERIAL_4_IRQ_HANDLER_DEF()        void UART4_IRQHandler(void)
+#endif
+
+#define SERIAL_5_ENABLE                     1
+#if SERIAL_5_ENABLE
+#  define SERIAL_5_UART                    UART5
+#  define SERIAL_5_IRQ_HANDLER_DEF()        void UART5_IRQHandler(void)
+#endif
+
 /* Wire (Software I2C) */
 #define WIRE_USE_FULL_SPEED_I2C             0
 #define WIRE_SDA_PIN                        PB7
diff --git a/platform.txt b/platform.txt
index 3b81079..9968a51 100644
--- a/platform.txt
+++ b/platform.txt
@@ -65,4 +65,4 @@ tools.Artery_ISP_Console.path={runtime.tools.Artery_ISP_Console.path}
 
 tools.Artery_ISP_Console.upload.params.verbose=-d
 tools.Artery_ISP_Console.upload.params.quiet=
-tools.Artery_ISP_Console.upload.pattern=sh "{path}/{cmd}" "{build.path}/{build.project_name}.hex"
+tools.Artery_ISP_Console.upload.pattern="{path}/{cmd}" "{build.path}/{build.project_name}.hex"