The "APK" format indicates it is meant to be sideloaded, as it is not commonly found on the Google Play Store due to its specialized, low-level nature. Many versions of US Butil are derived from open-source projects like usb-serial-for-android or customized builds by device manufacturers (e.g., for rugged tablets or POS systems).
Debugging USB host stack without recompiling the kernel. usbutil apk for android
The app attempts to load necessary kernel drivers dynamically. If your device is rooted, US Butil can insert kernel modules on the fly. Without root, it works with Android’s USB host stack but has fewer features. The "APK" format indicates it is meant to