USB Debug Guard

USB Debug Guard is a root-only tool for long USB debugging sessions. It protects the display while keeping ADB reachable, then restores the previous display settings when protection stops.

Features

• Detects USB data connections and ADB state through Android system APIs, without routine Root polling.
• Turns the screen off while keeping ADB reachable, or keeps it awake at minimum brightness for devices that lose ADB when the display sleeps.
• Saves and restores the previous display settings.
• Can lock the device after USB disconnects.
• Runs only after you enable its foreground service.
• Stops automatic Root work after a denial, timeout, exception, or process cleanup failure, preventing an endless su retry loop.
• English and Simplified Chinese.

Requirements

• A working Root manager such as Magisk or KernelSU, able to run Android settings and input commands.
• A USB data connection. A charge-only cable or charger does not start protection.

Root behavior varies between devices, OEM firmware, and Root managers. Test the app on a non-critical device before relying on it for unattended sessions.