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-rw-r--r--supervisor/shared/usb/usb.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/supervisor/shared/usb/usb.c b/supervisor/shared/usb/usb.c
index 5b020b8a0..3c777c505 100644
--- a/supervisor/shared/usb/usb.c
+++ b/supervisor/shared/usb/usb.c
@@ -62,6 +62,7 @@ void load_serial_number(void) {
uint8_t raw_id[COMMON_HAL_MCU_PROCESSOR_UID_LENGTH];
common_hal_mcu_processor_get_uid(raw_id);
+ usb_serial_number[0] = 0x300 | MP_ARRAY_SIZE(usb_serial_number);
for (int i = 0; i < COMMON_HAL_MCU_PROCESSOR_UID_LENGTH; i++) {
for (int j = 0; j < 2; j++) {
uint8_t nibble = (raw_id[i] >> (j * 4)) & 0xf;