diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9ba3e51..ff32e33 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -50,8 +50,9 @@ add_subdirectory(boot)
 add_target(AIKON1 STM32G071 DEAD_TIME=35 COMP_MAP=213 IO_PA6)
 add_target(AIRBOT1 AT32F421 DEAD_TIME=66 COMP_MAP=321 SENS_MAP=0xA3A6 VOLT_MUL=74 CURR_MUL=30 LED_MAP=0xA15B3B4)
 add_target(AIRBOT2 STM32F051 DEAD_TIME=26 COMP_MAP=321 SENS_MAP=0xA3 VOLT_MUL=74 IO_PA2)
+add_target(DYS1 STM32F051 DEAD_TIME=26 COMP_MAP=123 LED_MAP=0xA15B3B4 LED_INV IO_PA2)
 add_target(EMAX1 STM32F051 DEAD_TIME=26 COMP_MAP=123 IO_PA2)
-add_target(ESCAPE1 STM32G071 DEAD_TIME=35 COMP_MAP=123 SENS_MAP=0xA5A4 VOLT_MUL=110 CURR_MUL=30 LED_WS2812 IO_PA2)
+add_target(ESCAPE1 STM32G071 DEAD_TIME=35 COMP_MAP=123 SENS_MAP=0xA5A4 VOLT_MUL=110 CURR_MUL=30 LED_WS2812 IO_PA2 IO_AUX)
 add_target(FLYCOLOR1 STM32F051 DEAD_TIME=26 COMP_MAP=123 SENS_MAP=0xA6 VOLT_MUL=110 LED_MAP=0xB5B4B3 IO_PA2)
 add_target(FLYCOLOR2 STM32G071 DEAD_TIME=35 COMP_MAP=123 SENS_MAP=0xA6 VOLT_MUL=110 LED_MAP=0xB8)
 add_target(HAKRC1 STM32F051 DEAD_TIME=26 COMP_MAP=213 SENS_MAP=0xA3 VOLT_MUL=110 LED_MAP=0xA15B5B3 LED_INV)
diff --git a/boot/CMakeLists.txt b/boot/CMakeLists.txt
index 2677465..4d84585 100644
--- a/boot/CMakeLists.txt
+++ b/boot/CMakeLists.txt
@@ -1,6 +1,6 @@
 add_target(BOOT1_PA2 STM32F0 IO_PA2)
 add_target(BOOT1_PB4 STM32F0)
-add_target(BOOT2_PA2 STM32G0 IO_PA2)
+add_target(BOOT2_PA2 STM32G0 IO_PA2 IO_AUX)
 add_target(BOOT2_PA6 STM32G0 IO_PA6)
 add_target(BOOT2_PB4 STM32G0)
 add_target(BOOT3_PA2 STM32F0 IO_PA2 USARTv1)
diff --git a/boot/mcu/STM32F0/config.c b/boot/mcu/STM32F0/config.c
index 95e2132..120dbba 100644
--- a/boot/mcu/STM32F0/config.c
+++ b/boot/mcu/STM32F0/config.c
@@ -33,8 +33,8 @@ void init(void) {
 	RCC_APB1ENR |= RCC_APB1ENR_USART2EN;
 	GPIOA_AFRL |= 0x100; // A2 (USART2_TX)
 	GPIOA_AFRH |= 0x10000000; // A15 (USART2_RX)
-	GPIOA_PUPDR |= 0x80000010; // A2 (pull-up), A15 (pull-down)
-	GPIOA_MODER &= ~0x40000010; // A2 (USART2_TX), A15 (USART2_RX)
+	GPIOA_PUPDR |= 0x10; // A2 (pull-up)
+	GPIOA_MODER &= ~0x10; // A2 (USART2_TX)
 #else
 	RCC_APB1ENR |= RCC_APB1ENR_TIM3EN;
 #ifdef IO_PA6
diff --git a/boot/mcu/STM32G0/config.c b/boot/mcu/STM32G0/config.c
index a58020a..d2bed2b 100644
--- a/boot/mcu/STM32G0/config.c
+++ b/boot/mcu/STM32G0/config.c
@@ -32,8 +32,8 @@ void init(void) {
 	RCC_APBENR1 |= RCC_APBENR1_USART2EN;
 	GPIOA_AFRL |= 0x100; // A2 (USART2_TX)
 	GPIOA_AFRH |= 0x10000000; // A15 (USART2_RX)
-	GPIOA_PUPDR |= 0x80000010; // A2 (pull-up), A15 (pull-down)
-	GPIOA_MODER &= ~0x40000010; // A2 (USART2_TX), A15 (USART2_RX)
+	GPIOA_PUPDR |= 0x10; // A2 (pull-up)
+	GPIOA_MODER &= ~0x10; // A2 (USART2_TX)
 #else
 	RCC_APBENR1 |= RCC_APBENR1_TIM3EN;
 #ifdef IO_PA6
diff --git a/boot/src/io.c b/boot/src/io.c
index f0a317c..01b20c4 100644
--- a/boot/src/io.c
+++ b/boot/src/io.c
@@ -30,6 +30,9 @@
 
 void initio(void) {
 #ifdef IO_PA2
+#ifdef IO_AUX
+	GPIOA_PUPDR |= 0x80000000; // A15 (pull-down)
+	GPIOA_MODER &= ~0x40000000; // A15 (USART2_RX)
 	TIM14_ARR = CLK_CNT(20000) - 1;
 	TIM14_EGR = TIM_EGR_UG;
 	TIM14_CR1 = TIM_CR1_CEN;
@@ -40,6 +43,9 @@ void initio(void) {
 			break;
 		}
 	}
+#else
+	USART2_CR3 = USART_CR3_HDSEL;
+#endif
 	USART2_BRR = CLK_CNT(38400);
 	USART2_CR1 = USART_CR1_UE | USART_CR1_TE | USART_CR1_RE;
 #else
diff --git a/src/io.c b/src/io.c
index ac95063..d44c1b2 100644
--- a/src/io.c
+++ b/src/io.c
@@ -74,24 +74,21 @@ static void entryirq(void) {
 		ioirq = cliirq;
 #ifdef IO_PA2
 		io_serial();
-		int r1 = GPIOA_ODR;
-		int r2 = GPIOA_PUPDR;
-		int r3 = GPIOA_MODER;
-		GPIOA_ODR = r1 & ~0x8000; // In case A15 is output
-		GPIOA_PUPDR = r2 | 0x80000000; // A15 (pull-down)
-		GPIOA_MODER = (r3 | 0xc0000000) & ~0x40000000; // A15 (USART2_RX)
+#ifdef IO_AUX
+		GPIOA_PUPDR |= 0x80000000; // A15 (pull-down)
+		GPIOA_MODER &= ~0x40000000; // A15 (USART2_RX)
 		TIM15_ARR = CLK_CNT(20000) - 1;
 		TIM15_EGR = TIM_EGR_UG;
 		TIM15_CR1 = TIM_CR1_CEN | TIM_CR1_OPM;
 		while (TIM15_CR1 & TIM_CR1_CEN) { // Wait for 50us high level on A15
 			if (!(GPIOA_IDR & 0x8000)) { // A15 low
-				GPIOA_ODR = r1;
-				GPIOA_PUPDR = r2;
-				GPIOA_MODER = r3;
 				USART2_CR3 = USART_CR3_HDSEL;
 				break;
 			}
 		}
+#else
+		USART2_CR3 = USART_CR3_HDSEL;
+#endif
 		USART2_BRR = CLK_CNT(38400);
 		USART2_CR1 = USART_CR1_UE | USART_CR1_TE | USART_CR1_RE | USART_CR1_RXNEIE;
 #else
diff --git a/src/util.c b/src/util.c
index 483d2a9..8f3c49f 100644
--- a/src/util.c
+++ b/src/util.c
@@ -238,7 +238,7 @@ int playmusic(const char *str, int vol) {
 #ifdef PWM_ENABLE
 	TIM1_CCMR1 = TIM_CCMR1_OC1M_FORCE_LOW | TIM_CCMR1_OC2PE | TIM_CCMR1_OC2M_PWM1;
 	TIM1_CCMR2 = TIM_CCMR2_OC3M_FORCE_LOW;
-	int er = TIM_CCER_CC2E;
+	int er = TIM_CCER_CC1NE | TIM_CCER_CC2E | TIM_CCER_CC3NE;
 #else
 	TIM1_CCMR1 = TIM_CCMR1_OC1M_FORCE_HIGH | TIM_CCMR1_OC2PE | TIM_CCMR1_OC2M_PWM1;
 	TIM1_CCMR2 = TIM_CCMR2_OC3M_FORCE_HIGH;