Dear User, I am individual and with 15+ yrs of total experience. I have been working into Mobility from last 6+ yrs. I can upgrade your APK to latest OS and API version (23+) with Android Studio. Do let me know if your project has any third party components dependancy, so that we can identify at early stage. I would be greatly appreciated if you take some time out and read my proposal, I am flexible enought and open to provide you enhancement, improve App Perfomance, security etc.