USB Debug Guard

USB Debug Guard

Turn the screen off during long USB debugging sessions while keeping ADB alive

Nongfsq Development System

Download (1.1 MB)

Screenshots

Screenshot of USB Debug Guard Screenshot of USB Debug Guard Screenshot of USB Debug Guard

Description

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.

What’s new (0.1.5)

Much smaller download: the APK drops from about 12.6 MB to 1.1 MB. Guard behavior and Root safety are unchanged.

Versions

Version Date Size Requires Android Download
0.1.5 current
e2d4013ff3b28961…
 2026-10-27 1.1 MB API 26

Permissions

What the app asks the system for. Android only grants sensitive access after you confirm it.

  • Internet accessSend and receive data over the internet.
  • Foreground serviceKeep running in the background, visible in the status bar.
  • FOREGROUND_SERVICE_SPECIAL_USE
  • NotificationsShow notifications.
  • Run at startupStart automatically after the device is switched on.
  • Prevent sleepingKeep the device from going to sleep.
  • usbdebugguard.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

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