diff --git a/firmware/libboard/owhw/include/board.h b/firmware/libboard/owhw/include/board.h
index 44472d0..f929771 100644
--- a/firmware/libboard/owhw/include/board.h
+++ b/firmware/libboard/owhw/include/board.h
@@ -46,6 +46,9 @@
 /** index for green LED in LEDs pin definition array */
 #define LED_NUM_GREEN   1
 
+/* pin connected to the SIMTRACE_BOOTLOADER signal. set high to force DFU bootloader start */
+#define PIN_BOOTLOADER		{PIO_PA31, PIOA, ID_PIOA, PIO_INPUT, PIO_DEFAULT}
+
 /* USIM 2 interface (USART) */
 #define PIN_USIM2_CLK		{PIO_PA2, PIOA, ID_PIOA, PIO_PERIPH_B, PIO_DEFAULT}
 #define PIN_USIM2_IO		{PIO_PA6, PIOA, ID_PIOA, PIO_PERIPH_A, PIO_DEFAULT}
diff --git a/firmware/libboard/owhw/source/owhw.c b/firmware/libboard/owhw/source/owhw.c
index 3bf51ec..516d592 100644
--- a/firmware/libboard/owhw/source/owhw.c
+++ b/firmware/libboard/owhw/source/owhw.c
@@ -1,7 +1,7 @@
 /* Card simulator specific functions
  *
  * (C) 2015-2017 by Harald Welte <hwelte@hmw-consulting.de>
- * (C) 2018, sysmocom -s.f.m.c. GmbH, Author: Kevin Redon <kredon@sysmocom.de>
+ * (C) 2018-2019, sysmocom -s.f.m.c. GmbH, Author: Kevin Redon <kredon@sysmocom.de>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -65,3 +65,16 @@
 {
 	PIO_Configure(pins_cardsim, ARRAY_SIZE(pins_cardsim));
 }
+
+int board_override_enter_dfu(void)
+{
+	const Pin bl_pin = PIN_BOOTLOADER;
+
+	PIO_Configure(&bl_pin, 1);
+
+	if (PIO_Get(&bl_pin) == 0) { // signal low
+		return 0; // do not override enter DFU
+	} else {
+		return 1; // override enter DFU
+	}
+}