Resolution Guide

Troubleshooting Common Failures

When Android mirroring doesn't connect right away, 99% of failures fall into one of four categories: unrecognized hardware, missing authorization, charge-only cables, or local Wi-Fi subnet isolation.

Not Detected

Phone doesn't appear

Unauthorized

RSA prompt missing

Charge-Only Cable

No data transfer pins

Wireless Fails

Wi-Fi connection drop

1. Device Not Detected

If you plug in your phone and MirrorDroid displays “Waiting for device...” without changing state:

Check USB Configuration Mode

When plugged into a Mac, Android often defaults to “No data transfer (Charging only)”.

1. Swipe down from the top of your phone screen to open notifications.

2. Tap the notification titled “Charging this device via USB” (or “Android System — USB file transfer”).

3. Switch the mode from Charge only to File Transfer / Android Auto (MTP) or PTP.

Samsung One UI 6 “Auto Blocker”

A recent Samsung security feature that completely blocks USB data until turned off.

Go to Settings → Security and privacy → Auto Blocker. Turn the switch Off. Samsung Knox Auto Blocker prevents computers from initiating USB debugging sessions.

Direct Mac Port vs USB-C Hub

Unpowered multi-port dongles can drop USB signal integrity.

Connect directly into one of your Mac's built-in Thunderbolt/USB-C ports rather than through a cheap multi-port dongle or HDMI dock.

2. Device Shows “Unauthorized”

This means the Mac sees the device over USB, but Android has not accepted your Mac's cryptographic RSA key.

The Phone Screen Must Be Unlocked

Android does not display the RSA authorization prompt while the device is locked.

Unlock your phone with your fingerprint, face, or passcode. Once unlocked, look for the dialog: “Allow USB debugging?”. Check Always allow from this computer and tap Allow.

How to Force Re-Prompt: Revoke Authorizations

If you previously tapped “Cancel” or denied permission, Android remembers this decision.

1. Open Settings → Developer options on your phone.

2. Tap Revoke USB debugging authorizations and press OK.

3. Toggle USB debugging off and back on.

4. Unplug the USB cable from your Mac and plug it back in. The authorization prompt will immediately re-appear.

3. The Cable is Charge-Only

Many budget USB cables sold at gas stations or bundled with wireless headphones only possess positive and negative power wires — they completely lack the D+ and D- data lines required for computer communication.

How to verify your cable on your Mac:

Click the Apple Logo () at the top left of your Mac screen.
Hold the Option key and click System Information....
Select USB from the left sidebar under Hardware.
Look through the USB Device Tree. If your phone manufacturer (Samsung, Google, Xiaomi) does not appear in the tree, your cable is charge-only or defective.

Recommended Solution: Use the official USB-C cable that came in your phone's retail box or an Apple / Anker data-sync cable.

4. Wireless Pairing Fails

MirrorDroid allows you to disconnect the USB cable and mirror untethered over Wi-Fi. If pairing or reconnection fails:

Same Local Wi-Fi Subnet Required

Both your Mac and your Android phone must be on the exact same Wi-Fi network.

Make sure your phone isn't on 5G mobile data, a VPN, or a separate Guest Wi-Fi network. Guest Wi-Fi networks in offices and hotels enforce “Client Isolation”, which stops devices from discovering one another.

Initial USB Handshake

The most reliable way to initiate wireless mirroring.

In MirrorDroid, plug in via USB first. In the MirrorDroid device toolbar, click Switch to Wireless. MirrorDroid enables TCP/IP mode on port 5555 and establishes the wireless bridge. You can then safely unplug the cable.

Back to USB Debugging Guide Frequently Asked Questions