diff --git a/cores/beken-72xx/base/lt_api.c b/cores/beken-72xx/base/lt_api.c
index 1191cb2..04c0416 100644
--- a/cores/beken-72xx/base/lt_api.c
+++ b/cores/beken-72xx/base/lt_api.c
@@ -29,12 +29,6 @@ lt_cpu_model_t lt_cpu_get_model() {
 	return CPU_MODEL_ENUM(FAMILY, chipId);
 }
 
-uint32_t lt_cpu_get_mac_id() {
-	uint8_t mac[6];
-	cfg_load_mac(mac); // force loading MAC from TLV (ignore user-set WiFi MAC)
-	return (mac[3]) | (mac[4] << 8) | (mac[5] << 16);
-}
-
 const char *lt_cpu_get_core_type() {
 	return "ARM968E-S";
 }
@@ -45,6 +39,10 @@ const char *lt_cpu_get_core_type() {
  | |  | |/ _ \ \ / / |/ __/ _ \
  | |__| |  __/\ V /| | (_|  __/
  |_____/ \___| \_/ |_|\___\__*/
+void lt_get_device_mac(uint8_t *mac) {
+	cfg_load_mac(mac);
+}
+
 void lt_reboot() {
 	bk_reboot();
 }
diff --git a/cores/common/base/api/lt_cpu.h b/cores/common/base/api/lt_cpu.h
index 7feb523..f2c6b80 100644
--- a/cores/common/base/api/lt_cpu.h
+++ b/cores/common/base/api/lt_cpu.h
@@ -38,6 +38,7 @@ uint32_t lt_cpu_get_unique_id();
 /**
  * @brief Get CPU ID based on the last three octets of MAC address.
  * Note: the number is 24-bit (with the MSB being zero).
+ * The 3rd-to-last octet is least-significant, the last octet is most-significant.
  */
 uint32_t lt_cpu_get_mac_id();
 
diff --git a/cores/common/base/api/lt_device.h b/cores/common/base/api/lt_device.h
index 36e9a14..43d8477 100644
--- a/cores/common/base/api/lt_device.h
+++ b/cores/common/base/api/lt_device.h
@@ -20,6 +20,13 @@ const char *lt_get_board_code();
  */
 const char *lt_get_device_name();
 
+/**
+ * @brief Read device's *default* MAC address into 'mac' array.
+ * This can be used even without Wi-Fi enabled, and will ignore
+ * user-changed Wi-Fi MAC (if changing is possible).
+ */
+void lt_get_device_mac(uint8_t *mac);
+
 /**
  * @brief Reboot the CPU.
  */
diff --git a/cores/common/base/lt_api.c b/cores/common/base/lt_api.c
index df0e15d..b65a7ad 100644
--- a/cores/common/base/lt_api.c
+++ b/cores/common/base/lt_api.c
@@ -39,6 +39,12 @@ __attribute__((weak)) uint32_t lt_cpu_get_unique_id() {
 	return lt_cpu_get_mac_id();
 }
 
+__attribute__((weak)) uint32_t lt_cpu_get_mac_id() {
+	uint8_t mac[6];
+	lt_get_device_mac(mac);
+	return (mac[3] << 0) | (mac[4] << 8) | (mac[5] << 16);
+}
+
 __attribute__((weak)) uint8_t lt_cpu_get_core_count() {
 	return 1;
 }
diff --git a/cores/realtek-amb/arduino/libraries/WiFi/WiFiSTA.cpp b/cores/realtek-amb/arduino/libraries/WiFi/WiFiSTA.cpp
index 7067a8f..926ecc7 100644
--- a/cores/realtek-amb/arduino/libraries/WiFi/WiFiSTA.cpp
+++ b/cores/realtek-amb/arduino/libraries/WiFi/WiFiSTA.cpp
@@ -158,10 +158,7 @@ IPAddress WiFiClass::localIP() {
 
 uint8_t *WiFiClass::macAddress(uint8_t *mac) {
 	if ((getMode() & WIFI_MODE_STA) == 0) {
-		uint8_t *efuse = (uint8_t *)malloc(512);
-		EFUSE_LogicalMap_Read(efuse);
-		memcpy(mac, efuse + 0x11A, ETH_ALEN);
-		free(efuse);
+		lt_get_device_mac(mac);
 		return mac;
 	}
 	memcpy(mac, NETIF_RTW_STA.hwaddr, ETH_ALEN);
diff --git a/cores/realtek-ambz/base/lt_api.c b/cores/realtek-ambz/base/lt_api.c
index 94624e6..2d7181a 100644
--- a/cores/realtek-ambz/base/lt_api.c
+++ b/cores/realtek-ambz/base/lt_api.c
@@ -57,6 +57,13 @@ uint32_t lt_cpu_get_freq() {
  | |  | |/ _ \ \ / / |/ __/ _ \
  | |__| |  __/\ V /| | (_|  __/
  |_____/ \___| \_/ |_|\___\__*/
+void lt_get_device_mac(uint8_t *mac) {
+	uint8_t *efuse = (uint8_t *)malloc(512);
+	EFUSE_LogicalMap_Read(efuse);
+	memcpy(mac, efuse + 0x11A, 6);
+	free(efuse);
+}
+
 bool lt_reboot_download_mode() {
 	// mww 0x40000138 0x8
 	HAL_WRITE32(SYSTEM_CTRL_BASE, REG_SYS_NORESET_FF, 0x08);
diff --git a/cores/realtek-ambz2/base/lt_api.c b/cores/realtek-ambz2/base/lt_api.c
index 3de1f67..ae1df72 100644
--- a/cores/realtek-ambz2/base/lt_api.c
+++ b/cores/realtek-ambz2/base/lt_api.c
@@ -28,12 +28,6 @@ lt_cpu_model_t lt_cpu_get_model() {
 	return CPU_MODEL_ENUM(FAMILY, (chip_id & 0xFF) | flash_mode);
 }
 
-uint32_t lt_cpu_get_mac_id() {
-	uint8_t mac[3];
-	efuse_logical_read(0x11A + 3, 3, mac);
-	return (mac[0] << 0) | (mac[1] << 8) | (mac[2] << 16);
-}
-
 const char *lt_cpu_get_core_type() {
 	return "ARM Cortex-M4";
 }
@@ -48,6 +42,10 @@ uint32_t lt_cpu_get_freq() {
  | |  | |/ _ \ \ / / |/ __/ _ \
  | |__| |  __/\ V /| | (_|  __/
  |_____/ \___| \_/ |_|\___\__*/
+void lt_get_device_mac(uint8_t *mac) {
+	efuse_logical_read(0x11A, 6, mac);
+}
+
 void lt_reboot() {
 	sys_cpu_reset();
 	while (1) {}