diff --git a/src/main/io/serial.c b/src/main/io/serial.c
index 56fec19a92..d8e7b0a2a6 100644
--- a/src/main/io/serial.c
+++ b/src/main/io/serial.c
@@ -91,13 +91,13 @@ const serialPortConstraint_t serialPortConstraints[SERIAL_PORT_COUNT] = {
     {SERIAL_PORT_USB_VCP,       9600,   115200,   SPF_NONE },
 #endif
 #ifdef USE_USART1
-    {SERIAL_PORT_USART1,        9600,   115200,   SPF_NONE | SPF_SUPPORTS_SBUS_MODE | SPF_SUPPORTS_BIDIR_MODE},
+    {SERIAL_PORT_USART1,        9600,   250000,   SPF_SUPPORTS_SBUS_MODE | SPF_SUPPORTS_BIDIR_MODE},
 #endif
 #ifdef USE_USART2
-    {SERIAL_PORT_USART2,        9600,   115200,   SPF_SUPPORTS_CALLBACK | SPF_SUPPORTS_SBUS_MODE | SPF_SUPPORTS_BIDIR_MODE},
+    {SERIAL_PORT_USART2,        9600,   250000,   SPF_SUPPORTS_CALLBACK | SPF_SUPPORTS_SBUS_MODE | SPF_SUPPORTS_BIDIR_MODE},
 #endif
 #ifdef USE_USART3
-    {SERIAL_PORT_USART3,        9600,   115200,   SPF_SUPPORTS_CALLBACK | SPF_SUPPORTS_SBUS_MODE | SPF_SUPPORTS_BIDIR_MODE},
+    {SERIAL_PORT_USART3,        9600,   250000,   SPF_SUPPORTS_CALLBACK | SPF_SUPPORTS_SBUS_MODE | SPF_SUPPORTS_BIDIR_MODE},
 #endif
 };
 
@@ -117,8 +117,8 @@ const serialPortConstraint_t serialPortConstraints[SERIAL_PORT_COUNT] = {
 #ifdef USE_VCP
     {SERIAL_PORT_USB_VCP,       9600,   115200,   SPF_NONE },
 #endif
-    {SERIAL_PORT_USART1,        9600, 115200,   SPF_NONE | SPF_SUPPORTS_SBUS_MODE | SPF_SUPPORTS_BIDIR_MODE},
-    {SERIAL_PORT_USART3,        9600, 115200,   SPF_SUPPORTS_CALLBACK | SPF_SUPPORTS_SBUS_MODE | SPF_SUPPORTS_BIDIR_MODE},
+    {SERIAL_PORT_USART1,        9600, 250000,   SPF_SUPPORTS_SBUS_MODE | SPF_SUPPORTS_BIDIR_MODE},
+    {SERIAL_PORT_USART3,        9600, 250000,   SPF_SUPPORTS_CALLBACK | SPF_SUPPORTS_SBUS_MODE | SPF_SUPPORTS_BIDIR_MODE},
     {SERIAL_PORT_SOFTSERIAL1,   9600, 19200,    SPF_SUPPORTS_CALLBACK | SPF_IS_SOFTWARE_INVERTABLE}
 };
 #else
@@ -133,7 +133,7 @@ static serialPortFunction_t serialPortFunctions[SERIAL_PORT_COUNT] = {
 };
 
 const serialPortConstraint_t serialPortConstraints[SERIAL_PORT_COUNT] = {
-    {SERIAL_PORT_USART1,        9600, 250000,   SPF_NONE | SPF_SUPPORTS_SBUS_MODE | SPF_SUPPORTS_BIDIR_MODE},
+    {SERIAL_PORT_USART1,        9600, 250000,   SPF_SUPPORTS_SBUS_MODE | SPF_SUPPORTS_BIDIR_MODE},
     {SERIAL_PORT_USART2,        9600, 250000,   SPF_SUPPORTS_CALLBACK | SPF_SUPPORTS_SBUS_MODE | SPF_SUPPORTS_BIDIR_MODE},
 #if (SERIAL_PORT_COUNT > 2)
     {SERIAL_PORT_SOFTSERIAL1,   9600, 19200,    SPF_SUPPORTS_CALLBACK | SPF_IS_SOFTWARE_INVERTABLE},