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diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/examples/dfu/open_bootloader/main.c b/thirdparty/nRF5_SDK_15.0.0_a53641a/examples/dfu/open_bootloader/main.c
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+++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/examples/dfu/open_bootloader/main.c
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+/**
+ * Copyright (c) 2017 - 2018, Nordic Semiconductor ASA
+ * 
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ * 
+ * 2. Redistributions in binary form, except as embedded into a Nordic
+ *    Semiconductor ASA integrated circuit in a product or a software update for
+ *    such product, must reproduce the above copyright notice, this list of
+ *    conditions and the following disclaimer in the documentation and/or other
+ *    materials provided with the distribution.
+ * 
+ * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ * 
+ * 4. This software, with or without modification, must only be used with a
+ *    Nordic Semiconductor ASA integrated circuit.
+ * 
+ * 5. Any software provided in binary form under this license must not be reverse
+ *    engineered, decompiled, modified and/or disassembled.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+ * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ */
+/** @file
+ *
+ * @defgroup bootloader_open_usb_main main.c
+ * @{
+ * @ingroup bootloader_open_usb
+ * @brief Bootloader project main file for Open DFU over USB.
+ *
+ */
+
+#include <stdint.h>
+#include "boards.h"
+#include "nrf_mbr.h"
+#include "nrf_bootloader.h"
+#include "nrf_bootloader_app_start.h"
+#include "nrf_dfu.h"
+#include "nrf_log.h"
+#include "nrf_log_ctrl.h"
+#include "nrf_log_default_backends.h"
+#include "app_error.h"
+#include "app_error_weak.h"
+#include "nrf_bootloader_info.h"
+#include "nrf_dfu_utils.h"
+#include "led_softblink.h"
+#include "app_timer.h"
+#include "nrf_delay.h"
+
+/* Timer used to blink LED on DFU progress. */
+APP_TIMER_DEF(m_dfu_progress_led_timer);
+
+static void on_error(void)
+{
+    NRF_LOG_FINAL_FLUSH();
+
+#if NRF_MODULE_ENABLED(NRF_LOG_BACKEND_RTT)
+    // To allow the buffer to be flushed by the host.
+    nrf_delay_ms(100);
+#endif
+#ifdef NRF_DFU_DEBUG_VERSION
+    NRF_BREAKPOINT_COND;
+#endif
+    NVIC_SystemReset();
+}
+
+
+void app_error_handler(uint32_t error_code, uint32_t line_num, const uint8_t * p_file_name)
+{
+    NRF_LOG_ERROR("app_error_handler err_code:%d %s:%d", error_code, p_file_name, line_num);
+    on_error();
+}
+
+
+void app_error_fault_handler(uint32_t id, uint32_t pc, uint32_t info)
+{
+    NRF_LOG_ERROR("Received a fault! id: 0x%08x, pc: 0x%08x, info: 0x%08x", id, pc, info);
+    on_error();
+}
+
+
+void app_error_handler_bare(uint32_t error_code)
+{
+    NRF_LOG_ERROR("Received an error: 0x%08x!", error_code);
+    on_error();
+}
+
+
+static void dfu_progress_led_timeout_handler(void * p_context)
+{
+    app_timer_id_t timer = (app_timer_id_t)p_context;
+
+    uint32_t err_code = app_timer_start(timer,
+                                        APP_TIMER_TICKS(DFU_LED_CONFIG_PROGRESS_BLINK_MS),
+                                        p_context);
+    APP_ERROR_CHECK(err_code);
+
+    bsp_board_led_invert(BSP_BOARD_LED_1);
+}
+
+/**
+ * @brief Function notifies certain events in DFU process.
+ */
+static void dfu_observer(nrf_dfu_evt_type_t evt_type)
+{
+    static bool timer_created = false;
+    uint32_t err_code;
+
+    if (!timer_created)
+    {
+        err_code = app_timer_create(&m_dfu_progress_led_timer,
+                                    APP_TIMER_MODE_SINGLE_SHOT,
+                                    dfu_progress_led_timeout_handler);
+        APP_ERROR_CHECK(err_code);
+        timer_created = true;
+    }
+
+    switch (evt_type)
+    {
+        case NRF_DFU_EVT_DFU_FAILED:
+        case NRF_DFU_EVT_DFU_ABORTED:
+            err_code = led_softblink_stop();
+            APP_ERROR_CHECK(err_code);
+
+            err_code = app_timer_stop(m_dfu_progress_led_timer);
+            APP_ERROR_CHECK(err_code);
+
+            err_code = led_softblink_start(BSP_LED_1_MASK);
+            APP_ERROR_CHECK(err_code);
+
+            break;
+        case NRF_DFU_EVT_DFU_INITIALIZED:
+        {
+            led_sb_init_params_t led_sb_init_param = LED_SB_INIT_DEFAULT_PARAMS(BSP_LED_1_MASK);
+
+            uint32_t ticks = APP_TIMER_TICKS(DFU_LED_CONFIG_TRANSPORT_INACTIVE_BREATH_MS);
+            led_sb_init_param.p_leds_port    = BSP_LED_1_PORT;
+            led_sb_init_param.on_time_ticks  = ticks;
+            led_sb_init_param.off_time_ticks = ticks;
+            led_sb_init_param.duty_cycle_max = 255;
+
+            err_code = led_softblink_init(&led_sb_init_param);
+            APP_ERROR_CHECK(err_code);
+
+            err_code = led_softblink_start(BSP_LED_1_MASK);
+            APP_ERROR_CHECK(err_code);
+            break;
+        }
+        case NRF_DFU_EVT_TRANSPORT_ACTIVATED:
+        {
+            uint32_t ticks = APP_TIMER_TICKS(DFU_LED_CONFIG_TRANSPORT_ACTIVE_BREATH_MS);
+            led_softblink_off_time_set(ticks);
+            led_softblink_on_time_set(ticks);
+            break;
+        }
+        case NRF_DFU_EVT_TRANSPORT_DEACTIVATED:
+        {
+            uint32_t ticks =  APP_TIMER_TICKS(DFU_LED_CONFIG_PROGRESS_BLINK_MS);
+            err_code = led_softblink_stop();
+            APP_ERROR_CHECK(err_code);
+
+            err_code = app_timer_start(m_dfu_progress_led_timer, ticks, m_dfu_progress_led_timer);
+            APP_ERROR_CHECK(err_code);
+
+            break;
+        }
+        default:
+            break;
+    }
+}
+/**@brief Function for application main entry.
+ */
+int main(void)
+{
+    uint32_t ret_val;
+
+    // Protect MBR and bootloader code from being overwritten.
+    ret_val = nrf_bootloader_flash_protect(0, MBR_SIZE, false);
+    APP_ERROR_CHECK(ret_val);
+    ret_val = nrf_bootloader_flash_protect(BOOTLOADER_START_ADDR, BOOTLOADER_SIZE, false);
+    APP_ERROR_CHECK(ret_val);
+
+    ret_val = NRF_LOG_INIT(app_timer_cnt_get);
+    APP_ERROR_CHECK(ret_val);
+    NRF_LOG_DEFAULT_BACKENDS_INIT();
+
+    NRF_LOG_INFO("Open USB bootloader started");
+    NRF_LOG_FLUSH();
+
+    ret_val = nrf_bootloader_init(dfu_observer);
+    APP_ERROR_CHECK(ret_val);
+
+    NRF_LOG_FLUSH();
+
+    // Either there was no DFU functionality enabled in this project or the DFU module detected
+    // no ongoing DFU operation and found a valid main application.
+    // Boot the main application.
+    nrf_bootloader_app_start();
+
+    // Should never be reached.
+    NRF_LOG_INFO("After main");
+    NRF_LOG_FLUSH();
+}
+
+/**
+ * @}
+ */