Security Policy Errors

Fix Microsoft Defender Repeatedly Detecting Android Threats

Maira Mehtab Sep 27, 2026 870 views

Question details

The user is experiencing repeated threat detections for Tool:AndroidOS/ZkarletFlash and btnotification by Microsoft Defender on their Android tablet.

Product: Microsoft Defender
Device & OS: Android
Scenario: Running real-time protection or antivirus scans on an Android tablet, potentially connected to a smartwatch.
Observed behavior: Microsoft Defender repeatedly flags Tool:AndroidOS/ZkarletFlash and btnotification as security threats, raising concerns about false positives.

Before you start

Before proceeding, ensure your Android device is connected to a secure Wi-Fi network. Do not approve or add any flagged applications to your Allowed apps list until their safety is fully verified.

Solution 1Recommended

Update Android OS and Microsoft Defender

Keeping your operating system and security apps up to date is the primary way to fix false positives and patch vulnerabilities.

Antivirus applications rely on up-to-date virus definitions. Updating Microsoft Defender ensures it has the latest threat intelligence, which often resolves false positive detections.

Update Defender via Play Store

Open the Google Play Store on your Android tablet, tap your profile icon, and select 'Manage apps & device'. Find Microsoft Defender and tap 'Update'.

Reinstall Defender (If Needed)

If the app is already up to date but the issue persists, uninstall Microsoft Defender from your device settings and reinstall it fresh from the Google Play Store.

Update Android OS

Go to your Android device 'Settings', select 'System', and tap 'System update' to download and install any pending operating system updates.

Solution 2

Verify Installation Sources and Remove Suspicious Apps

If Defender continues to flag apps like btnotification or ZkarletFlash, you should remove them unless you are absolutely sure of their origin.

Solution 3

Submit Suspected False Positives to Microsoft

If you are confident that a flagged file is safe, report it to Microsoft instead of bypassing the security block.

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Frequently Asked Questions

What is Tool:AndroidOS/ZkarletFlash?

Tool:AndroidOS/ZkarletFlash is identified by Microsoft as a potentially malicious tool or threat designed for Android operating systems. If Microsoft Defender detects this, you should immediately remove the associated application from your device.

Why is btnotification being flagged as a threat?

The 'btnotification' app is often used to sync Android devices with smartwatches. However, because some versions request extensive system permissions or are downloaded from untrusted third-party sources, Microsoft Defender may flag it as a privacy risk or false positive.

Should I add flagged apps to the Allowed apps list in Defender?

No. You should not add apps like btnotification to your Allowed apps list unless you have absolutely confirmed they are safe and were downloaded directly from a verified, official source like the Google Play Store.

How do I fix repeated false positive detections in Microsoft Defender?

First, ensure your Android OS and the Microsoft Defender app are updated to the latest versions to receive the newest virus definitions. If a legitimate app is still being flagged, submit the file to the Microsoft Security Intelligence portal for review rather than whitelisting it.

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