🔧 USB Debugging · 2026
ADB Device Not Found or Unauthorized?
Flutter USB Debugging Solutions
You plug in your Android device, run adb devices, and see nothing — or it shows "unauthorized". This guide covers every fix: enabling USB debugging, installing drivers, restarting adb, authorizing the connection, and troubleshooting on Windows, macOS, and Linux.
Why Does ADB Fail to Detect My Device?
The Android Debug Bridge (ADB) is the primary tool for communicating with your Android device. When it fails, you'll see errors like "device not found", "unauthorized", or "offline". The causes range from missing USB drivers, incorrect USB configuration, or the device not trusting your computer's RSA key. This guide systematically addresses each scenario to get you debugging in minutes.
Step‑by‑Step Q&A
Click any question to reveal a detailed, actionable solution. These fixes are applicable for all platforms.
✅ Key Takeaways — ADB Reliability
- Enable Developer Options and USB Debugging — This is the first and most important step.
- Revoke USB debugging authorizations on the device to reset the trust relationship.
- Restart the adb server with
adb kill-serverandadb start-serverafter connecting. - Install the correct USB driver (Windows) or ensure udev rules (Linux).
- Check your USB cable and port — faulty cables are a common hidden cause.
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