diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index cd4b62a..162a59f 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -8,6 +8,7 @@
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
 
     <application
+        android:name=".NeoApp"
         android:allowBackup="true"
         android:extractNativeLibs="true"
         android:icon="@mipmap/ic_launcher"
diff --git a/app/src/main/assets/font.ttf b/app/src/main/assets/font.ttf
new file mode 100644
index 0000000..32f856a
Binary files /dev/null and b/app/src/main/assets/font.ttf differ
diff --git a/app/src/main/java/io/neoterm/NeoApp.java b/app/src/main/java/io/neoterm/NeoApp.java
new file mode 100644
index 0000000..a6ebbde
--- /dev/null
+++ b/app/src/main/java/io/neoterm/NeoApp.java
@@ -0,0 +1,21 @@
+package io.neoterm;
+
+import android.app.Application;
+
+/**
+ * @author kiva
+ */
+
+public class NeoApp extends Application {
+    private static NeoApp app;
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        app = this;
+    }
+
+    public static NeoApp get() {
+        return app;
+    }
+}
diff --git a/app/src/main/java/io/neoterm/customize/font/FontManager.kt b/app/src/main/java/io/neoterm/customize/font/FontManager.kt
new file mode 100644
index 0000000..b94ed4c
--- /dev/null
+++ b/app/src/main/java/io/neoterm/customize/font/FontManager.kt
@@ -0,0 +1,18 @@
+package io.neoterm.customize.font
+
+import android.graphics.Typeface
+import io.neoterm.NeoApp
+
+/**
+ * @author kiva
+ */
+object FontManager {
+    private var DEFAULT_FONT: Typeface? = null
+
+    fun getDefaultFont(): Typeface {
+        if (DEFAULT_FONT == null) {
+            DEFAULT_FONT = Typeface.createFromAsset(NeoApp.get().assets, "font.ttf")
+        }
+        return DEFAULT_FONT!!
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/io/neoterm/installer/BaseFileInstaller.java b/app/src/main/java/io/neoterm/installer/BaseFileInstaller.java
index 44a180c..0b05b81 100644
--- a/app/src/main/java/io/neoterm/installer/BaseFileInstaller.java
+++ b/app/src/main/java/io/neoterm/installer/BaseFileInstaller.java
@@ -135,7 +135,7 @@ public final class BaseFileInstaller {
 
     private static URL determineZipUrl() throws MalformedURLException {
         String archName = determineArchName();
-        return new URL("https://kernel19.cc/neoterm/boot/" + archName + ".zip");
+        return new URL("https://neoterm.kernel19.cc/boot/" + archName + ".zip");
     }
 
     public static String determineArchName() {
diff --git a/app/src/main/java/io/neoterm/services/NeoTermService.kt b/app/src/main/java/io/neoterm/services/NeoTermService.kt
index e4de39c..b4f3d9d 100644
--- a/app/src/main/java/io/neoterm/services/NeoTermService.kt
+++ b/app/src/main/java/io/neoterm/services/NeoTermService.kt
@@ -10,6 +10,7 @@ import android.os.Binder
 import android.os.IBinder
 import android.support.v4.content.WakefulBroadcastReceiver
 import android.util.Log
+import android.widget.Toast
 import io.neoterm.R
 import io.neoterm.backend.EmulatorDebug
 import io.neoterm.backend.TerminalSession
@@ -85,7 +86,8 @@ class NeoTermService : Service() {
                 NeoTermPath.USR_PATH + "/bin/" + NeoTermPreference.loadString(R.string.key_general_shell, "sh")
 
             if (!File(executablePath).exists()) {
-                NeoTermPath.USR_PATH + "/bin/sh"
+                Toast.makeText(this, getString(R.string.shell_not_found, executablePath), Toast.LENGTH_LONG).show()
+                executablePath = NeoTermPath.USR_PATH + "/bin/sh"
             }
         }
 
diff --git a/app/src/main/java/io/neoterm/view/ExtraKeysView.java b/app/src/main/java/io/neoterm/view/ExtraKeysView.java
index fb3d3a8..e9b164b 100755
--- a/app/src/main/java/io/neoterm/view/ExtraKeysView.java
+++ b/app/src/main/java/io/neoterm/view/ExtraKeysView.java
@@ -8,6 +8,7 @@ import android.view.KeyEvent;
 import android.view.View;
 import android.widget.Button;
 import android.widget.GridLayout;
+import android.widget.Toast;
 import android.widget.ToggleButton;
 
 import java.io.File;
@@ -17,6 +18,7 @@ import java.util.List;
 import io.neoterm.R;
 import io.neoterm.backend.TerminalSession;
 import io.neoterm.customize.NeoTermPath;
+import io.neoterm.customize.font.FontManager;
 import io.neoterm.customize.shortcut.ShortcutConfig;
 import io.neoterm.customize.shortcut.ShortcutConfigParser;
 import io.neoterm.preference.NeoTermPreference;
@@ -38,6 +40,11 @@ public final class ExtraKeysView extends GridLayout {
     public static final ControlButton TAB = new ControlButton(KEY_TAB);
     public static final StatedControlButton CTRL = new StatedControlButton(KEY_CTRL);
 
+//    public static final ControlButton ARROW_UP = new ControlButton("▲");
+//    public static final ControlButton ARROW_DOWN = new ControlButton("▼");
+//    public static final ControlButton ARROW_LEFT = new ControlButton("◀");
+//    public static final ControlButton ARROW_RIGHT = new ControlButton("▶");
+
     public static final ControlButton ARROW_UP = new ControlButton("▲");
     public static final ControlButton ARROW_DOWN = new ControlButton("▼");
     public static final ControlButton ARROW_LEFT = new ControlButton("◀");
@@ -169,6 +176,12 @@ public final class ExtraKeysView extends GridLayout {
                     button = new Button(getContext(), null, android.R.attr.buttonBarButtonStyle);
                 }
 
+                try {
+                    button.setTypeface(FontManager.INSTANCE.getDefaultFont());
+                } catch (Throwable e) {
+                    e.printStackTrace();
+                    Toast.makeText(getContext(), e.getLocalizedMessage(), Toast.LENGTH_LONG).show();
+                }
                 button.setText(extraButton.buttonText);
                 button.setTextColor(NORMAL_TEXT_COLOR);
                 button.setAllCaps(false);
diff --git a/app/src/main/res/values-zh/strings.xml b/app/src/main/res/values-zh/strings.xml
index 584f7b5..00bff1e 100644
--- a/app/src/main/res/values-zh/strings.xml
+++ b/app/src/main/res/values-zh/strings.xml
@@ -29,4 +29,5 @@
     <string name="toggle_ime">切换输入法</string>
     <string name="toggle_tab_switcher_menu_item">切换窗口</string>
     <string name="ui_settings">界面设置</string>
+    <string name="shell_not_found">Shell %s 未找到, 请先安装.</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/preference_keys.xml b/app/src/main/res/values/preference_keys.xml
index ae487ec..9dc963e 100644
--- a/app/src/main/res/values/preference_keys.xml
+++ b/app/src/main/res/values/preference_keys.xml
@@ -10,7 +10,7 @@
     <string name="key_ui_color_scheme" translatable="false">neoterm_ui_color_scheme</string>
     <string name="key_ui_next_tab_anim" translatable="false">neoterm_ui_next_tab_anim</string>
     <string name="key_ui_suggestions" translatable="false">neoterm_ui_suggestions</string>
-    <string name="key_ui_wide_char_weigh_explicit">neoterm_ui_wide_char_explicit</string>
+    <string name="key_ui_wide_char_weigh_explicit" translatable="false">neoterm_ui_wide_char_explicit</string>
 
     <string name="key_package_source" translatable="false">neoterm_package_source</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 8a424f2..54785df 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -32,6 +32,7 @@
     <string name="pref_ui_wide_char_weight_explicit_desc">If suggestion bar show incorrect, please enable this</string>
     <string name="pref_package_source">Source</string>
     <string name="toggle_ime">Toggle IME</string>
+    <string name="shell_not_found">Shell %s not found, please install it first.</string>
 
     <string-array name="pref_ui_color_scheme_entries" translatable="false">
         <item>Default</item>
diff --git a/app/src/test/java/io/neoterm/ExampleUnitTest.kt b/app/src/test/java/io/neoterm/ExampleUnitTest.kt
index 5d0820a..6643ff3 100644
--- a/app/src/test/java/io/neoterm/ExampleUnitTest.kt
+++ b/app/src/test/java/io/neoterm/ExampleUnitTest.kt
@@ -19,4 +19,10 @@ class ExampleUnitTest {
         parser.setInput(File("docs/shortcut-key-config.example"))
         val config = parser.parse()
     }
+
+    @Test
+    fun test_wchar() {
+        println("▲".length)
+        println("X".length)
+    }
 }
\ No newline at end of file