Tecno Buds Companion App for iOS & Android with Full Feature Suite

I want to develop a companion app for Tecno Buds on both iOS and Android. The app should include features such as custom EQ, HearID sound profiles, ANC controls, firmware updates, customizable touch/button... (Budget: $250 - $750 USD, Jobs: Android, Bluetooth, Flutter, iPhone, Mobile App Development, Objective C, React Native, UI / User Interface)