APKPure Appを使用する
Development Settingsの旧いバージョンをダウンロードすることが可能
迅速に開発者の設定を開き、エンジニアモード、秘密のコードを追加して管理
For Android users to quickly open the development of personnel options, engineering mode, battery power, background service management and other functions;and this is a secret code management tools, such as Android phone secret code *#*#4636#*#* to open mode of engineering, as well as some MTK Enginerr mode *#*#3646633#*#* code.
You can also from forums or other place to search for your phone special secret code,then used this tool to add and manage.