diff --git a/OtaUpdate/Widget.cpp b/OtaUpdate/Widget.cpp
index e736d66..8e6ad13 100644
--- a/OtaUpdate/Widget.cpp
+++ b/OtaUpdate/Widget.cpp
@@ -13,6 +13,7 @@
 #include <QProgressBar>
 #include <QPushButton>
 #include <QSerialPortInfo>
+#include <QTimer>
 #include <QVBoxLayout>
 #include <filesystem>
 
@@ -53,7 +54,8 @@ Widget::Widget(QWidget *parent) : QWidget(parent) {
     setAcceptDrops(true);
 }
 
-Widget::~Widget() {}
+Widget::~Widget() {
+}
 
 void Widget::start() {
     m_progressBar->setValue(0);
@@ -90,6 +92,9 @@ void Widget::start() {
 void Widget::onCdcDeviceDiscovered(const QSerialPortInfo &info) {
     auto status = m_updater->open(info);
     LOG(info) << "open cdc port: " << info.portName().toStdString() << ", status: " << status;
+    if (!status) {
+        QTimer::singleShot(0, this, [this]() { m_updater->startSearchDevice(); });
+    }
 }
 
 void Widget::onSelectButtonClicked() {
diff --git a/Peripheral/CdcUpdater.cpp b/Peripheral/CdcUpdater.cpp
index f317308..9bd5e57 100644
--- a/Peripheral/CdcUpdater.cpp
+++ b/Peripheral/CdcUpdater.cpp
@@ -42,9 +42,7 @@ CdcUpdater::~CdcUpdater() {
 
 void CdcUpdater::start(const QString &path, const QSerialPortInfo &info) {
     if (info.isNull()) {
-        if (m_timerId < 0) {
-            m_timerId = startTimer(1000);
-        }
+        startSearchDevice();
     } else {
         open(info);
     }
@@ -54,6 +52,12 @@ void CdcUpdater::start(const QString &path, const QSerialPortInfo &info) {
     emit progressChanged(++m_progress);
 }
 
+void CdcUpdater::startSearchDevice() {
+    if (m_timerId < 0) {
+        m_timerId = startTimer(1000);
+    }
+}
+
 bool CdcUpdater::open(const QSerialPortInfo &info) {
     m_serialPort = std::make_shared<QSerialPort>(info);
     connect(m_serialPort.get(), &QSerialPort::readyRead, this, &CdcUpdater::onReadyRead);
diff --git a/Peripheral/CdcUpdater.h b/Peripheral/CdcUpdater.h
index 9e8b52b..e84b541 100644
--- a/Peripheral/CdcUpdater.h
+++ b/Peripheral/CdcUpdater.h
@@ -37,6 +37,7 @@ public:
     CdcUpdater(QObject *parent = nullptr);
     ~CdcUpdater();
     void start(const QString &path, const QSerialPortInfo &info = QSerialPortInfo());
+    void startSearchDevice();
     bool open(const QSerialPortInfo &info);
     static std::optional<QSerialPortInfo> searchDevice();