diff --git a/mainwindow.cpp b/mainwindow.cpp
index ed4d2f3..751bdab 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -3,6 +3,7 @@
 #include "worker.h"
 #include "utils.h"
 #include "progress_event.h"
+#include "update_dc_event.h"
 #include "plugins/interfaces.h"
 
 #include <QDateTime>
@@ -10,14 +11,102 @@
 #include <QDebug>
 #include <QScrollBar>
 
-MainWindow::MainWindow(hwinf *hw, Worker *worker, QWidget *parent)
+
+
+#if EMERGENCY_LEAVE_BL==1
+static int step = 0;
+
+void MainWindow::emergencyLeaveBL() {
+    //
+    qCritical() << __func__ << step;
+    switch(step) {
+    case 0:
+        if (m_hw->dc_openSerial(5, "115200", "ttymxc2", 1)) {
+            qCritical() << __func__ << "open ok";
+            step++;
+            QThread::msleep(2000);
+            m_hw->dc_autoRequest(false);
+            emit leaveBL();
+        }
+        break;
+    case 1:
+        m_hw->bl_rebootDC();
+        QThread::msleep(1000);
+        qCritical() << __func__ << "reboot ok" << QDateTime::currentDateTime().toString(Qt::ISODateWithMs);
+        step++;
+        emit leaveBL();
+        break;
+    case 2:
+    case 3:
+    case 4:
+    case 5:
+    case 6:
+        m_hw->bl_startBL();
+        QThread::msleep(1000);
+        qCritical() << __func__ << "start" << QDateTime::currentDateTime().toString(Qt::ISODateWithMs);
+        step++;
+        emit leaveBL();
+        break;
+    case 7:
+    case 9:
+    case 11:
+    case 13:
+    case 15:
+        m_hw->bl_checkBL();
+        qCritical() << __func__ << "check" << QDateTime::currentDateTime().toString(Qt::ISODateWithMs);
+        QThread::msleep(1500);
+        ++step;
+        emit leaveBL();
+        break;
+    case 8:
+    case 10:
+    case 12:
+    case 14:
+    case 16:
+        qCritical() << __func__ << "is Up..." << QDateTime::currentDateTime().toString(Qt::ISODateWithMs);
+        if (m_hw->bl_isUp()) {
+            qCritical() << __func__ << "is Up...OK" << step << QDateTime::currentDateTime().toString(Qt::ISODateWithMs);
+            QThread::msleep(5000);
+            step = 16;
+        } else {
+            qCritical() << __func__ << "is Up...NO" << step << QDateTime::currentDateTime().toString(Qt::ISODateWithMs);
+        }
+        ++step;
+        emit leaveBL();
+        break;
+    case 17:
+    case 18:
+    case 19:
+        qCritical() << __func__ << "stop" << QDateTime::currentDateTime().toString(Qt::ISODateWithMs);
+        m_hw->bl_stopBL();
+        QThread::msleep(1000);
+        //m_hw->dc_closeSerial();
+        ++step;
+        emit leaveBL();
+        break;
+    }
+}
+#endif
+
+MainWindow::MainWindow(hwinf *hw, Worker *worker, Update *update, QWidget *parent)
     : QMainWindow(parent)
     , ui(new Ui::MainWindow)
     , m_hw(hw)
     , m_worker(worker)
     , m_width(70)
     , m_progressRunning(false)
-    , m_progressValue(0) {
+    , m_progressValue(0)
+    , m_update(update)
+    , m_updateStep(UpdateDcEvent::UpdateStep::NONE) {
+
+#if EMERGENCY_LEAVE_BL==1
+    QTimer *t = new QTimer(this);
+    connect(t, SIGNAL(timeout()), this, SLOT(emergencyLeaveBL()));
+    connect(this, SIGNAL(leaveBL()), this, SLOT(emergencyLeaveBL()), Qt::QueuedConnection);
+    t->setSingleShot(true);
+    t->start(1000);
+    return;
+#endif
 
     this->setStatusBar(new QStatusBar(this));
     QFont f;