diff --git a/common/pm3process.cpp b/common/pm3process.cpp
index 6ea2492..dc219b7 100644
--- a/common/pm3process.cpp
+++ b/common/pm3process.cpp
@@ -16,16 +16,25 @@ PM3Process::PM3Process(QThread* thread, QObject* parent): QProcess(parent)
 
 void PM3Process::connectPM3(const QString path, const QString port)
 {
+    QString result;
     setRequiringOutput(true);
 
     // using "-f" option to make the client output flushed after every print.
     start(path, QStringList() << port << "-f", QProcess::Unbuffered | QProcess::ReadWrite);
     if(waitForStarted(10000))
     {
-        while(waitForReadyRead(1000))
-            ;
+        waitForReadyRead(1000);
         setRequiringOutput(false);
-        QString result = *requiredOutput;
+        result = *requiredOutput;
+        if(result.indexOf("[=]") != -1)
+        {
+            emit changeClientType(Util::CLIENTTYPE_ICEMAN);
+            setRequiringOutput(true);
+            write("hw version\r\n");
+            waitForReadyRead(1000);
+            result = *requiredOutput;
+            setRequiringOutput(false);
+        }
         if(result.indexOf("os: ") != -1) // make sure the PM3 is connected
         {
             result = result.mid(result.indexOf("os: "));
diff --git a/common/pm3process.h b/common/pm3process.h
index 17cee5f..093ebfd 100644
--- a/common/pm3process.h
+++ b/common/pm3process.h
@@ -9,6 +9,8 @@
 #include <QtSerialPort/QSerialPortInfo>
 #include <QtSerialPort/QSerialPort>
 
+#include "util.h"
+
 class PM3Process : public QProcess
 {
     Q_OBJECT
@@ -34,6 +36,7 @@ private:
 signals:
     void PM3StatedChanged(bool st, QString info = "");
     void newOutput(QString output);
+    void changeClientType(Util::ClientType);
 };
 
 #endif // PM3PROCESS_H
diff --git a/common/util.cpp b/common/util.cpp
index 5eb3af9..11f0a9f 100644
--- a/common/util.cpp
+++ b/common/util.cpp
@@ -1,11 +1,12 @@
 #include "util.h"
 
-Util::Util(Util::ClientType clientType, QObject *parent) : QObject(parent)
+Util::Util(QObject *parent) : QObject(parent)
 {
     isRequiringOutput = false;
     requiredOutput = new QString();
     timeStamp = QTime::currentTime();
-    this->clientType = clientType;
+    this->clientType = CLIENTTYPE_OFFICIAL;
+    qRegisterMetaType<Util::ClientType>("Util::ClientType");
 }
 
 void Util::processOutput(QString output)
@@ -55,3 +56,8 @@ Util::ClientType Util::getClientType()
 {
     return this->clientType;
 }
+
+void Util::setClientType(Util::ClientType clientType)
+{
+    this->clientType = clientType;
+}
diff --git a/common/util.h b/common/util.h
index a790c94..27bee4a 100644
--- a/common/util.h
+++ b/common/util.h
@@ -8,6 +8,7 @@
 #include <QApplication>
 #include <QTime>
 #include <QTimer>
+#include <QMetaType>
 
 class Util : public QObject
 {
@@ -15,10 +16,13 @@ class Util : public QObject
 public:
     enum ClientType
     {
-        OFFICIAL,
-        ICEMAN,
+        CLIENTTYPE_OFFICIAL,
+        CLIENTTYPE_ICEMAN,
     };
-    explicit Util(Util::ClientType clientType, QObject *parent = nullptr);
+
+    Q_ENUM(Util::ClientType)
+
+    explicit Util(QObject *parent = nullptr);
 
     void execCMD(QString cmd);
     QString execCMDWithOutput(QString cmd, unsigned long timeout = 2000);
@@ -26,6 +30,7 @@ public:
     ClientType getClientType();
 public slots:
     void processOutput(QString output);
+    void setClientType(Util::ClientType clientType);
 
 private:
     bool isRequiringOutput;
diff --git a/module/mifare.cpp b/module/mifare.cpp
index 22e86d2..1dbaa10 100644
--- a/module/mifare.cpp
+++ b/module/mifare.cpp
@@ -131,7 +131,7 @@ QString Mifare::_readblk(int blockId, KeyType keyType, const QString& key, int w
         return "";
     }
 
-    if(util->getClientType() == Util::OFFICIAL)
+    if(util->getClientType() == Util::CLIENTTYPE_OFFICIAL)
     {
         // use the given key type to read the target block
         result = util->execCMDWithOutput(
@@ -205,7 +205,7 @@ QStringList Mifare::_readsec(int sectorId, KeyType keyType, const QString& key,
         return data;
     }
 
-    if(util->getClientType() == Util::OFFICIAL)
+    if(util->getClientType() == Util::CLIENTTYPE_OFFICIAL)
     {
         result = util->execCMDWithOutput(
                      "hf mf rdsc "
diff --git a/ui/mainwindow.cpp b/ui/mainwindow.cpp
index f14f9e0..26d60d3 100644
--- a/ui/mainwindow.cpp
+++ b/ui/mainwindow.cpp
@@ -24,7 +24,7 @@ MainWindow::MainWindow(QWidget *parent):
     pm3Thread->start();
     pm3state = false;
 
-    util = new Util(Util::OFFICIAL, this);
+    util = new Util(this);
     mifare = new Mifare(ui, util, this);
 
 }
@@ -784,6 +784,7 @@ void MainWindow::uiInit()
 void MainWindow::signalInit()
 {
     connect(pm3, &PM3Process::newOutput, util, &Util::processOutput);
+    connect(pm3, &PM3Process::changeClientType, util, &Util::setClientType);
     connect(util, &Util::refreshOutput, this, &MainWindow::refreshOutput);
 
     connect(this, &MainWindow::connectPM3, pm3, &PM3Process::connectPM3);
diff --git a/ui/mf_trailerdecoderdialog.ui b/ui/mf_trailerdecoderdialog.ui
index afcc957..83d0926 100644
--- a/ui/mf_trailerdecoderdialog.ui
+++ b/ui/mf_trailerdecoderdialog.ui
@@ -11,7 +11,7 @@
    </rect>
   </property>
   <property name="windowTitle">
-   <string>Dialog</string>
+   <string>Trailer Decoder</string>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout_2">
    <item>