diff --git a/ports/stm32f4/boards/stm32f411ve_discovery/mpconfigboard.mk b/ports/stm32f4/boards/stm32f411ve_discovery/mpconfigboard.mk
index aa867c96f8..bbc2a4a049 100644
--- a/ports/stm32f4/boards/stm32f411ve_discovery/mpconfigboard.mk
+++ b/ports/stm32f4/boards/stm32f411ve_discovery/mpconfigboard.mk
@@ -1,7 +1,7 @@
 USB_VID = 0x239A
 USB_PID = 0x802A
 USB_PRODUCT = "STM32F411VE Discovery Board - CPy"
-USB_MANUFACTURER = "Adafruit Industries LLC"
+USB_MANUFACTURER = "STMicroelectronics"
 USB_REDUCED_ENDPOINT = 1
 
 INTERNAL_FLASH_FILESYSTEM = 1
diff --git a/ports/stm32f4/common-hal/microcontroller/Processor.c b/ports/stm32f4/common-hal/microcontroller/Processor.c
index c59c340c09..7117945b39 100644
--- a/ports/stm32f4/common-hal/microcontroller/Processor.c
+++ b/ports/stm32f4/common-hal/microcontroller/Processor.c
@@ -28,17 +28,20 @@
 #include "py/runtime.h"
 #include "supervisor/shared/translate.h"
 
+#include "stm32f4xx_hal.h"
+
+#define STM32_UUID ((uint32_t *)0x1FFF7A10)
 
 float common_hal_mcu_processor_get_temperature(void) {
     return 0;
 }
 
 uint32_t common_hal_mcu_processor_get_frequency(void) {
-    return 64000000ul;
+    return SystemCoreClock;
 }
 
 void common_hal_mcu_processor_get_uid(uint8_t raw_id[]) {
-    for (int i=0; i<2; i++) {
-        ((uint32_t*) raw_id)[i] = 0;
+    for (int i=0; i<3; i++) {
+        ((uint32_t*) raw_id)[i] = STM32_UUID[i];
     }
 }
diff --git a/ports/stm32f4/common-hal/microcontroller/Processor.h b/ports/stm32f4/common-hal/microcontroller/Processor.h
index c3ca4efd59..311333e7de 100644
--- a/ports/stm32f4/common-hal/microcontroller/Processor.h
+++ b/ports/stm32f4/common-hal/microcontroller/Processor.h
@@ -27,7 +27,7 @@
 #ifndef MICROPY_INCLUDED_STM32F4_COMMON_HAL_MICROCONTROLLER_PROCESSOR_H
 #define MICROPY_INCLUDED_STM32F4_COMMON_HAL_MICROCONTROLLER_PROCESSOR_H
 
-#define COMMON_HAL_MCU_PROCESSOR_UID_LENGTH 8
+#define COMMON_HAL_MCU_PROCESSOR_UID_LENGTH 12
 
 #include "py/obj.h"
 
diff --git a/ports/stm32f4/mpconfigport.mk b/ports/stm32f4/mpconfigport.mk
index 78c8e76300..3a8e6acc6f 100644
--- a/ports/stm32f4/mpconfigport.mk
+++ b/ports/stm32f4/mpconfigport.mk
@@ -7,7 +7,7 @@ MPY_TOOL_LONGINT_IMPL = -mlongint-impl=mpz
 INTERNAL_LIBM = 1
 
 # Chip supplied serial number, in bytes
-USB_SERIAL_NUMBER_LENGTH = 16
+USB_SERIAL_NUMBER_LENGTH = 24
 
 # Longints can be implemented as mpz, as longlong, or not
 LONGINT_IMPL = MPZ
diff --git a/supervisor/shared/usb/usb.c b/supervisor/shared/usb/usb.c
index cfb39d4bb5..b0880b1b62 100644
--- a/supervisor/shared/usb/usb.c
+++ b/supervisor/shared/usb/usb.c
@@ -34,7 +34,6 @@
 
 #include "tusb.h"
 
-#define COMMON_HAL_MCU_PROCESSOR_UID_LENGTH 8
 
 // Serial number as hex characters. This writes directly to the USB
 // descriptor.
@@ -43,7 +42,7 @@ extern uint16_t usb_serial_number[1 + COMMON_HAL_MCU_PROCESSOR_UID_LENGTH * 2];
 void load_serial_number(void) {
     // create serial number based on device unique id
     uint8_t raw_id[COMMON_HAL_MCU_PROCESSOR_UID_LENGTH];
-    //common_hal_mcu_processor_get_uid(raw_id);
+    common_hal_mcu_processor_get_uid(raw_id);
     for (int i=0; i<2; i++) {
         ((uint32_t*) raw_id)[i] = 0;
     }