diff --git a/firmware/apps/dfu/main.c b/firmware/apps/dfu/main.c
index 5f683ce0..01cf1e01 100644
--- a/firmware/apps/dfu/main.c
+++ b/firmware/apps/dfu/main.c
@@ -105,31 +105,10 @@ int USBDFU_handle_upload(uint8_t altif, unsigned int offset,
 	return req_len;
 }
 
-static int uart_has_loopback_jumper(void)
+/* can be overridden by board specific code, e.g. by pushbutton */
+WEAK int board_override_enter_dfu(void)
 {
-	unsigned int i;
-	const Pin uart_loopback_pins[] = {
-		{PIO_PA9A_URXD0, PIOA, ID_PIOA, PIO_INPUT, PIO_DEFAULT},
-		{PIO_PA10A_UTXD0, PIOA, ID_PIOA, PIO_OUTPUT_0, PIO_DEFAULT}
-	};
-
-	/* Configure UART pins as I/O */
-	PIO_Configure(uart_loopback_pins, PIO_LISTSIZE(uart_loopback_pins));
-
-	for (i = 0; i < 10; i++) {
-		/* Set TxD high; abort if RxD doesn't go high either */
-		PIO_Set(&uart_loopback_pins[1]);
-		if (!PIO_Get(&uart_loopback_pins[0]))
-			return 0;
-		/* Set TxD low, abort if RxD doesn't go low either */
-		PIO_Clear(&uart_loopback_pins[1]);
-		if (PIO_Get(&uart_loopback_pins[0]))
-			return 0;
-	}
-	/* if we reached here, RxD always follows TxD and thus a
-	 * loopback jumper has been placed on RxD/TxD, and we will boot
-	 * into DFU unconditionally */
-	return 1;
+	return 0;
 }
 
 /* using this function we can determine if we should enter DFU mode
@@ -139,7 +118,7 @@ int USBDFU_OverrideEnterDFU(void)
 	uint32_t *app_part = (uint32_t *)FLASH_ADDR(0);
 
 	/* If the loopback jumper is set, we enter DFU mode */
-	if (uart_has_loopback_jumper())
+	if (board_override_enter_dfu())
 		return 1;
 
 	/* if the first word of the application partition doesn't look
diff --git a/firmware/libboard/common/include/board_common.h b/firmware/libboard/common/include/board_common.h
index cfcc49e5..9cd1f89f 100644
--- a/firmware/libboard/common/include/board_common.h
+++ b/firmware/libboard/common/include/board_common.h
@@ -119,4 +119,5 @@
 
 extern void board_exec_dbg_cmd(int ch);
 extern void board_main_top(void);
+extern int board_override_enter_dfu(void);
 #endif
diff --git a/firmware/libboard/qmod/source/board_qmod.c b/firmware/libboard/qmod/source/board_qmod.c
index 49625793..0343895c 100644
--- a/firmware/libboard/qmod/source/board_qmod.c
+++ b/firmware/libboard/qmod/source/board_qmod.c
@@ -249,3 +249,39 @@ void board_main_top(void)
 	card_present_init();
 #endif
 }
+
+static int uart_has_loopback_jumper(void)
+{
+	unsigned int i;
+	const Pin uart_loopback_pins[] = {
+		{PIO_PA9A_URXD0, PIOA, ID_PIOA, PIO_INPUT, PIO_DEFAULT},
+		{PIO_PA10A_UTXD0, PIOA, ID_PIOA, PIO_OUTPUT_0, PIO_DEFAULT}
+	};
+
+	/* Configure UART pins as I/O */
+	PIO_Configure(uart_loopback_pins, PIO_LISTSIZE(uart_loopback_pins));
+
+	for (i = 0; i < 10; i++) {
+		/* Set TxD high; abort if RxD doesn't go high either */
+		PIO_Set(&uart_loopback_pins[1]);
+		if (!PIO_Get(&uart_loopback_pins[0]))
+			return 0;
+		/* Set TxD low, abort if RxD doesn't go low either */
+		PIO_Clear(&uart_loopback_pins[1]);
+		if (PIO_Get(&uart_loopback_pins[0]))
+			return 0;
+	}
+	/* if we reached here, RxD always follows TxD and thus a
+	 * loopback jumper has been placed on RxD/TxD, and we will boot
+	 * into DFU unconditionally */
+	return 1;
+}
+
+int board_override_enter_dfu(void)
+{
+	/* If the loopback jumper is set, we enter DFU mode */
+	if (uart_has_loopback_jumper())
+		return 1;
+
+	return 0;
+}