diff --git a/port/wiced/create_examples.py b/port/wiced/create_examples.py
index 6eb32f0a0..0bd4bd6d8 100755
--- a/port/wiced/create_examples.py
+++ b/port/wiced/create_examples.py
@@ -20,6 +20,7 @@ GLOBAL_INCLUDES += .
 
 $(NAME)_SOURCES := ../../../libraries/btstack/example/EXAMPLE.c
 $(NAME)_COMPONENTS += btstack/port/wiced
+$(NAME)_CFLAGS += ADDITIONAL_CFLAGS
 '''
 
 gatt_update_template = '''#!/bin/sh
@@ -45,7 +46,14 @@ if not "WICED Version" in wiced_version:
     sys.exit(1)
 
 # show WICED version
-print("Found %s" % wiced_version)
+wiced_version = wiced_version.split()[2]
+print("Found WICED SDK version: %s" % wiced_version)
+
+additional_cflags = ""
+if wiced_version < "3.4.0":
+    print("Adding WICED_UART_READ_DOES_NOT_RETURN_BYTES_READ for SDK < 3.4.0")
+    additional_cflags = "-DWICED_UART_READ_DOES_NOT_RETURN_BYTES_READ"
+
 
 # path to examples
 examples_embedded = script_path + "/../../example/"
@@ -68,7 +76,7 @@ for file in os.listdir(examples_embedded):
 
     # create .mk file
     with open(apps_folder + example + ".mk", "wt") as fout:
-        fout.write(mk_template.replace("EXAMPLE", example).replace("TOOL", script_path).replace("DATE",time.strftime("%c")))
+        fout.write(mk_template.replace("EXAMPLE", example).replace("TOOL", script_path).replace("ADDITIONAL_CFLAGS", additional_cflags).replace("DATE",time.strftime("%c")))
 
     # create update_gatt.sh if .gatt file is present
     gatt_path = examples_embedded + example + ".gatt"
diff --git a/port/wiced/hci_transport_h4_wiced.c b/port/wiced/hci_transport_h4_wiced.c
index f7804f5a8..445261812 100644
--- a/port/wiced/hci_transport_h4_wiced.c
+++ b/port/wiced/hci_transport_h4_wiced.c
@@ -121,10 +121,22 @@ static wiced_result_t h4_main_notify_packet_send(void *arg){
 }
 
 // executed on rx worker thread
+
 static void h4_rx_worker_receive_bytes(int bytes_to_read){
+
+#ifdef WICED_UART_READ_DOES_NOT_RETURN_BYTES_READ
+    // older API passes in number of bytes to read (checked in 3.3.1 and 3.4.0)
     platform_uart_receive_bytes(wiced_bt_uart_driver, &hci_packet[rx_worker_read_pos], bytes_to_read, WICED_NEVER_TIMEOUT);
+#else
+    // newer API uses pointer to return number of read bytes
+    uint32_t bytes = bytes_to_read;
+    platform_uart_receive_bytes(wiced_bt_uart_driver, &hci_packet[rx_worker_read_pos], &bytes, WICED_NEVER_TIMEOUT);
+    // assumption: bytes = bytes_to_rad as timeout is never    
+#endif
     rx_worker_read_pos += bytes_to_read;        
+
 }
+
 static wiced_result_t h4_rx_worker_receive_packet(void * arg){
 
 #ifdef WICED_BT_UART_MANUAL_CTS_RTS
diff --git a/port/wiced/readme.md b/port/wiced/readme.md
index 00ad89afd..4dcb51d6d 100644
--- a/port/wiced/readme.md
+++ b/port/wiced/readme.md
@@ -1,6 +1,6 @@
 # BTstack port for WICED platform
 
-WICED SDK 3.5.2 or higher required. With RedBear Duo, please follow their installation guide for WICED SDK first.
+Only tested on Redbear Duo platform. Please install [RedBear WICED Add-On](https://github.com/redbear/WICED-SDK) first.
 
 To integrate BTstack into the WICED SDK, please move the BTstack project into WICED-SDK-3.5.2/libraries.
 Then create projects for BTstack examples in WICED/apps/btstack by running:
@@ -15,8 +15,6 @@ to build the SPP-and-LE-Counter example.
 
 See WICED documentation about how to install it.
 
-Only tested on Redbear Duo platform.
-
 It should work with all WICED platforms that contain a Broadcom Bluetooth chipset.
 
 The maximal baud rate is limited to 3 mbps.
diff --git a/port/wiced/wiced.mk b/port/wiced/wiced.mk
index 8bcc1e077..59b7c293e 100644
--- a/port/wiced/wiced.mk
+++ b/port/wiced/wiced.mk
@@ -42,4 +42,9 @@ $(NAME)_SOURCES += \
 	btstack_run_loop_wiced.c                   \
 	hci_transport_h4_wiced.c                   \
 	../../chipset/bcm/btstack_chipset_bcm.c    \
-	../../../drivers/bluetooth/firmware/$(BT_CHIP)$(BT_CHIP_REVISION)/$(BT_CHIP_XTAL_FREQUENCY)/bt_firmware_image.c \
+
+ifeq ($(BT_CHIP_XTAL_FREQUENCY),)
+$(NAME)_SOURCES := ../../../drivers/bluetooth/firmware/$(BT_CHIP)$(BT_CHIP_REVISION)/bt_firmware_image.c
+else
+$(NAME)_SOURCES := ../../../drivers/bluetooth/firmware/$(BT_CHIP)$(BT_CHIP_REVISION)/$(BT_CHIP_XTAL_FREQUENCY)/bt_firmware_image.c
+endif