diff --git a/module/mifare.cpp b/module/mifare.cpp
index 055b91b..8bc7baf 100644
--- a/module/mifare.cpp
+++ b/module/mifare.cpp
@@ -297,7 +297,7 @@ QString Mifare::_readblk(int blockId, KeyType keyType, const QString& key, int w
             data.remove(" ");
             // when the target block is a key block and the given key type is KeyA, try to check whether the KeyB is valid(by Access Bits)
             // if the given key type is KeyB, it will never get the KeyA from the key block
-            if(isKeyBlock && keyType == KEY_A)
+            if(isKeyBlock && keyType == KEY_A) // in this case, the Access Bits is always accessible
             {
                 data.replace(0, 12, key);
                 QList<quint8> ACBits = data_getACBits(data.mid(12, 8));
diff --git a/ui/mainwindow.cpp b/ui/mainwindow.cpp
index ef0dc3f..0777242 100644
--- a/ui/mainwindow.cpp
+++ b/ui/mainwindow.cpp
@@ -77,6 +77,7 @@ void MainWindow::on_PM3_connectButton_clicked()
         QMessageBox::information(NULL, tr("Info"), tr("Plz choose a port first"), QMessageBox::Ok);
     else
     {
+        saveClientPath(ui->PM3_pathEdit->text());
         emit connectPM3(ui->PM3_pathEdit->text(), port);
     }
 }
@@ -237,6 +238,12 @@ void MainWindow::on_MF_fillKeysButton_clicked()
     mifare->data_fillKeys();
 }
 
+void MainWindow::on_MF_trailerDecoderButton_clicked()
+{
+    decDialog = new MF_trailerDecoderDialog(this);
+    decDialog->show();
+}
+
 void MainWindow::on_MF_fontButton_clicked()
 {
     bool isOK = false;
@@ -773,6 +780,10 @@ void MainWindow::uiInit()
     }
     settings->endGroup();
 
+    settings->beginGroup("Client_Path");
+    ui->PM3_pathEdit->setText(settings->value("path", "proxmark3").toString());
+    settings->endGroup();
+
     ui->MF_RW_keyTypeBox->addItem("A", Mifare::KEY_A);
     ui->MF_RW_keyTypeBox->addItem("B", Mifare::KEY_B);
 
@@ -896,6 +907,12 @@ void MainWindow::on_GroupBox_clicked(bool checked)
     settings->endGroup();
 }
 
+void MainWindow::saveClientPath(const QString& path)
+{
+    settings->beginGroup("Client_Path");
+    settings->setValue("path", path);
+    settings->endGroup();
+}
 // ***********************************************
 
 
@@ -904,9 +921,3 @@ void MainWindow::on_testButton_clicked()
 {
     mifare->_readsec(0, Mifare::KEY_A, "FFFFFFFFFFFF");
 }
-
-void MainWindow::on_MF_trailerDecoderButton_clicked()
-{
-    decDialog = new MF_trailerDecoderDialog(this);
-    decDialog->show();
-}
diff --git a/ui/mainwindow.h b/ui/mainwindow.h
index 1327e0a..3a02dd5 100644
--- a/ui/mainwindow.h
+++ b/ui/mainwindow.h
@@ -173,6 +173,7 @@ private:
     void MF_widgetReset();
     void setTableItem(QTableWidget *widget, int row, int column, const QString &text);
     void setState(bool st);
+    void saveClientPath(const QString &path);
 signals:
     void connectPM3(const QString path, const QString port);
     void killPM3();
diff --git a/ui/mainwindow.ui b/ui/mainwindow.ui
index 7096074..454dd5a 100644
--- a/ui/mainwindow.ui
+++ b/ui/mainwindow.ui
@@ -58,11 +58,7 @@
        </widget>
       </item>
       <item>
-       <widget class="QLineEdit" name="PM3_pathEdit">
-        <property name="text">
-         <string notr="true">../pm3/iceman-64/win64/proxmark3</string>
-        </property>
-       </widget>
+       <widget class="QLineEdit" name="PM3_pathEdit"/>
       </item>
       <item>
        <widget class="QComboBox" name="PM3_portBox">