diff --git a/mainwindow.cpp b/mainwindow.cpp
index 7ba4cd2..26f6df3 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -211,6 +211,86 @@ void MainWindow::customEvent(QEvent *event) {
         } else {
             qCritical() << "!!! UNKNOWN SENDER !!!";
         }
+    } else
+    if (event->type() == UpdateDcEvent::type()) {
+        UpdateDcEvent *pevent = (UpdateDcEvent *)event;
+        UpdateDcEvent::UpdateStep const updateStep = pevent->updateStep();
+        QObject const *sender = pevent->sender();
+        if (sender == m_worker) {
+            QDateTime const &recv = QDateTime::currentDateTime();
+            QDateTime const &send = pevent->sendDateTime();
+            qint64 const delay = recv.toMSecsSinceEpoch() - send.toMSecsSinceEpoch();
+            switch(updateStep) {
+            case UpdateDcEvent::UpdateStep::NONE:
+                break;
+            case UpdateDcEvent::UpdateStep::DC_REBOOT: {
+                m_hw->bl_rebootDC();
+                QString msg = QDateTime::currentDateTime().toString(Qt::ISODateWithMs)
+                          + QString(": reset device controller (delay=%1ms").arg(delay);
+                emit m_worker->showStatusMessage("dc update", msg);
+                Utils::printInfoMsg(msg.toUpper());
+                m_updateStep = UpdateDcEvent::UpdateStep::DC_REBOOT;
+            } break;
+            case UpdateDcEvent::UpdateStep::BL_START: {
+                QString const &msg = recv.toString(Qt::ISODateWithMs)
+                    + QString(": start bootloader (%1, delay=%2ms)").arg(pevent->count()).arg(delay);
+                emit m_worker->showStatusMessage("dc update", msg);
+                Utils::printInfoMsg(msg.toUpper());
+                m_hw->bl_startBL();
+                if (pevent->count() == BL_START_COUNT) {
+                    m_updateStep = UpdateDcEvent::UpdateStep::BL_START;
+                }
+            } break;
+            case UpdateDcEvent::UpdateStep::BL_CHECK: {
+                if (m_updateStep != UpdateDcEvent::UpdateStep::BL_IS_UP) {
+                    QString const &msg = recv.toString(Qt::ISODateWithMs)
+                        + QString(": request bootloader version (%1, delay=%2ms)").arg(pevent->count()).arg(delay);
+                    emit m_worker->showStatusMessage("dc update", msg);
+                    Utils::printInfoMsg(msg.toUpper());
+                    m_hw->bl_checkBL();
+                    //m_updateStep = UpdateDcEvent::UpdateStep::BL_CHECK;
+                }
+            } break;
+            case UpdateDcEvent::UpdateStep::BL_IS_UP: {
+                QString msg = recv.toString(Qt::ISODateWithMs)
+                    + QString(": check running bootloader (%1, delay=%2ms)").arg(pevent->count()).arg(delay);
+                emit m_worker->showStatusMessage("dc update", msg);
+                Utils::printInfoMsg(msg.toUpper());
+                if (m_updateStep != UpdateDcEvent::UpdateStep::BL_IS_UP) {
+                    if (m_hw->bl_isUp()) {
+                        msg = recv.toString(Qt::ISODateWithMs)
+                            + QString(": bootloader running (%1, delay=%2ms)").arg(pevent->count()).arg(delay);
+                        emit m_worker->showStatusMessage("dc update", msg);
+                        Utils::printInfoMsg(msg.toUpper());
+                        m_updateStep = UpdateDcEvent::UpdateStep::BL_IS_UP;
+                    } else {
+                        msg = recv.toString(Qt::ISODateWithMs)
+                            + QString(": bootloader stop requested (%1, delay=%2ms)").arg(pevent->count()).arg(delay);
+                        emit m_worker->showStatusMessage("dc update", msg);
+                        Utils::printInfoMsg(msg.toUpper());
+                        if (m_updateStep == UpdateDcEvent::UpdateStep::BL_STOP) {
+                            msg = QDateTime::currentDateTime().toString(Qt::ISODateWithMs)
+                                    + QString(": bootloader down (%1, delay=%2ms)").arg(pevent->count()).arg(delay);
+                            emit m_worker->showStatusMessage("dc update", msg);
+                            Utils::printInfoMsg(msg.toUpper());
+                            m_updateStep = UpdateDcEvent::UpdateStep::BL_IS_DOWN;
+                        }
+                    }
+                }
+            } break;
+            case UpdateDcEvent::UpdateStep::BL_STOP: {
+                QString const &msg = QDateTime::currentDateTime().toString(Qt::ISODateWithMs)
+                    + QString(": stop bootloader (%1, delay=%2ms)").arg(pevent->count()).arg(delay);
+                emit m_worker->showStatusMessage("dc update", msg);
+                Utils::printInfoMsg(msg.toUpper());
+                //if (m_bootLoaderIsUp) {
+                m_hw->bl_stopBL();
+                m_updateStep = UpdateDcEvent::UpdateStep::BL_STOP;
+                //}
+            } break;
+            default: ;
+            }
+        }
     }
 
     QThread::yieldCurrentThread();