diff --git a/port/stm32-f4discovery-cc256x/src/btstack_config.h b/port/stm32-f4discovery-cc256x/src/btstack_config.h
index d4fc9ef2d..7a964702a 100644
--- a/port/stm32-f4discovery-cc256x/src/btstack_config.h
+++ b/port/stm32-f4discovery-cc256x/src/btstack_config.h
@@ -16,7 +16,7 @@
 // #define ENABLE_LOG_INFO
 #define ENABLE_LOG_ERROR
 #define ENABLE_CC256X_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND
-#define ENABLE_EHCILL
+// #define ENABLE_EHCILL
 
 
 // BTstack configuration. buffers, sizes, ...
diff --git a/port/stm32-f4discovery-cc256x/src/port.c b/port/stm32-f4discovery-cc256x/src/port.c
index 4ea2fa735..a5e923e50 100644
--- a/port/stm32-f4discovery-cc256x/src/port.c
+++ b/port/stm32-f4discovery-cc256x/src/port.c
@@ -17,7 +17,7 @@ static btstack_packet_callback_registration_t hci_event_callback_registration;
 static const hci_transport_config_uart_t config = {
 	HCI_TRANSPORT_CONFIG_UART,
     115200,
-    0,
+    400000,
     1,
     NULL
 };