Chinese characters are displayed as blank box on the TextField in Taiwan Android 4.4.2/AIR4.0

Question

Chinese characters are displayed as blank box on the TextField in Taiwan Android 4.4.2/AIR4.0, such as Nexus7, HTC One,  but in mainland China Nexus7(Android 4.4.2/AIR4.0) showed normal
AIR SDK is 4.0.0.1628.
Hope it can be fixed as soon as possible.
Here is test code:
package
          import flash.display.Sprite;
          import flash.display.StageAlign;
          import flash.display.StageScaleMode;
          import flash.text.Font;
          import flash.text.TextField;
          import flash.text.TextFieldAutoSize;
          import flash.text.TextFormat;
          public class TestFont extends Sprite
                    public function TestFont()
                              stage.scaleMode = StageScaleMode.NO_SCALE;
                              stage.align = StageAlign.TOP_LEFT;
                              var sprite:Sprite = new Sprite();
                              var value1:String = "简体中文测试";
                              var value2:String = "繁體中文測試";
                              var txt11:TextField = createTextField(null, "11 "+value1);
                              txt11.x = 10;
                              txt11.y = 10;
                              sprite.addChild(txt11);
                              var txt12:TextField = createTextField(null, "12 "+value2);
                              txt12.x = txt11.x + txt11.width;
                              txt12.y = txt11.y;
                              sprite.addChild(txt12);
                              var txt21:TextField = createTextField("STHeitiTC-Medium","21 "+value1);
                              txt21.x = 10;
                              txt21.y = txt11.y + txt11.height;
                              sprite.addChild(txt21);
                              var txt22:TextField = createTextField("MSYH","22 "+value2);
                              txt22.x = txt21.x + txt21.width;
                              txt22.y = txt21.y;
                              sprite.addChild(txt22);
                              var lastY:int = txt22.y + txt22.height;
                              var fonts:Array = Font.enumerateFonts(true);
                              var index:int = 0;
                              for each (var font1:Font in fonts)
                                        index++;
                                        var txtF:TextField = createTextField(font1.fontName, index + "/" + fonts.length + " " + font1.fontName + " "+value1 +" " + value2);
                                        txtF.x = 10;
                                        txtF.y = lastY;
                                        sprite.addChild(txtF);
                                        lastY += txtF.height;
                              addChild(sprite);
                    public function createTextField(font:String, value:String):TextField{
                              var txt:TextField = new TextField();
                              txt.autoSize = TextFieldAutoSize.LEFT;
                              var format:TextFormat = new TextFormat();
                              if(font != null){
                                        format.font = font;
                                        txt.defaultTextFormat = format;
                                        txt.setTextFormat(format);
                              txt.text = value;
                              var dformat:TextFormat = txt.defaultTextFormat;
                              if(dformat != null){
                                        txt.text = value + " |" + dformat.font;
                              if(font != null){
                                        txt.setTextFormat(format);
                              return txt;

Answer 1

I am in mainland China, my Nexus7 can display chinese characters, but my friend in Taiwan, his android4.4.2 display chinese characters as blank.
I don't understand the reason.
By the way, TextFormat.font don't work, whatever I set any fonts, display are the same.
My screenshots:
Taiwan's screenshots: