diff --git a/hw/bsp/nutiny_sdk_nuc505/board.mk b/hw/bsp/nutiny_sdk_nuc505/board.mk
index 5fb2119b..8752ef8e 100644
--- a/hw/bsp/nutiny_sdk_nuc505/board.mk
+++ b/hw/bsp/nutiny_sdk_nuc505/board.mk
@@ -46,6 +46,16 @@ FREERTOS_PORT = ARM_CM4F
 JLINK_DEVICE = NUC505YO13Y
 JLINK_IF = swd
 
+# Note
+# To be able to program the SPI flash, it need to boot with ICP mode "1011". 
+# However, in ICP mode, opencod cannot establish connection to the mcu. 
+# Therefore, there is no easy command line flash for NUC505
+# It is probably better to just use Nuvoton NuMicro ICP programming on windows to program the board
+# - 1111 "SPI" (run from internal flash)
+# - 1110 "USB" (mass storage emulator that accepts a .bin file)
+# - 0111 "ICE-SPI" (allow external debugger access, but may not be programmable)
+# - 1011 ICP mode (programmable via NuMicro ICP programming tool)
+
 # Flash using Nuvoton's openocd fork at https://github.com/OpenNuvoton/OpenOCD-Nuvoton
 # Please compile and install it from github source
 flash: $(BUILD)/$(BOARD)-firmware.elf
diff --git a/src/portable/nuvoton/nuc505/dcd_nuc505.c b/src/portable/nuvoton/nuc505/dcd_nuc505.c
index e67b69ab..a7961a68 100644
--- a/src/portable/nuvoton/nuc505/dcd_nuc505.c
+++ b/src/portable/nuvoton/nuc505/dcd_nuc505.c
@@ -452,7 +452,9 @@ void dcd_int_handler(uint8_t rhport)
       USBD->CEPINTEN = USBD_CEPINTEN_SETUPPKIEN_Msk;
       USBD->BUSINTEN = USBD_BUSINTEN_RSTIEN_Msk | USBD_BUSINTEN_RESUMEIEN_Msk | USBD_BUSINTEN_SUSPENDIEN_Msk | USBD_BUSINTEN_DMADONEIEN_Msk;
       USBD->CEPINTSTS = 0x1ffc;
-      dcd_event_bus_signal(0, DCD_EVENT_BUS_RESET, true);
+
+      tusb_speed_t speed = (USBD->OPER & USBD_OPER_CURSPD_Msk) ? TUSB_SPEED_HIGH : TUSB_SPEED_FULL;
+      dcd_event_bus_reset(0, speed, true);
     }
 
     if (bus_state & USBD_BUSINTSTS_RESUMEIF_Msk)