If you have ever tried to connect an external USB device (like a game controller, a DSLR camera, a MIDI keyboard, or an Arduino board) to an Android device, you have likely encountered the invisible gatekeeper: .
Many budget or older tablets have the physical hardware to act as a USB Host (powering and talking to other devices), but the software flag is turned off to save power or simplify the OS. androidhardwareusbhostxml file download 2021