The MT Manager VIP version is unlocked. You can sign apk and even make apks unsigned to allow installation on top of modified versions of apps. This app is notorious for not working on all phones. If a crash log appears when you open the app, unfortunately, your phone is not compatible. There's nothing I can do about it.
MT Manager is a very powerful file manager and apk editor, you can use it to perform a variety of tasks on your phone such as file management, software modification, application