Android Studio Device Offline or Not Detected (ADB)

How to fix it

Try these in order — the most common fix is first.

1. 1. Use the Connection Assistant

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   1. Tools > Troubleshoot Device Connections
   2. Follow the steps, then click Restart ADB server on the last page
   Did this fix it? Yes No

2. 2. Re-enable USB debugging and authorization

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   1. On the phone open Settings > Developer options > USB debugging; if you can't see Developer options, tap Build number 7 times
   2. Run 'Revoke USB debugging authorizations', unplug and replug
   3. Accept the 'Allow USB debugging?' dialog on the phone
   Did this fix it? Yes No

3. 3. Restart ADB

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   1. Run adb kill-server then adb start-server
   2. Run adb devices and check the state
   Did this fix it? Yes No

4. 4. Check cable, port and drivers

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   1. Try a data-capable cable and another USB port
   2. On Windows install your OEM USB driver (see developer.android.com/studio/run/oem-usb)
   3. Update Platform Tools in SDK Manager
   Did this fix it? Yes No

5. 5. Linux: groups and udev

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   1. Run sudo usermod -aG plugdev $LOGNAME and log out and in
   2. Install udev rules: sudo apt-get install android-sdk-platform-tools-common
   Did this fix it? Yes No

6. 6. Use wireless debugging

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   1. On Android 11+ enable Wireless debugging in Developer options
   2. In Android Studio choose Pair Devices Using Wi-Fi from the run configurations menu and scan the QR code
   Did this fix it? Yes No

Symptoms

Your phone does not appear in the device list, adb devices shows 'offline' or 'unauthorized', or Android Studio says no devices found.

Why it happens

• USB debugging off or the RSA debugging prompt was not accepted
• Charge-only USB cable or wrong USB mode
• Missing OEM USB driver on Windows
• Stale ADB server or version mismatch
• Missing plugdev group or udev rules on Linux

This guide also covers

• android studio device offline
• adb device not detected
• android studio no devices found
• adb unauthorized fix

The same problem in other apps

All not loading, error messages & connection guides →

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Other Android Studio errors

• Android Studio Gradle Sync Failed
• Android Studio Emulator Not Starting
• Android Emulator HAXM / Hypervisor Error (VT-x, WHPX, AEHD)
• Android Studio Emulator Slow or Laggy
• Android Studio Slow and Using Too Much RAM
• Android Studio Gradle Build Slow
• Android Studio SDK Location Not Found
• Android Studio Build Failed: JDK, Gradle or AGP Version Mismatch