how to update virus definitions on android?

There is no specific way to automatically install Security intelligence updates for Microsoft Defender Antivirus, as these updates are released on a periodic basis. However, you can manually check for and install these updates by following the instructions provided here.

There are a few things that you can do to try and fix Windows Defender not updating:
Make sure that your antivirus software is up to date. Windows Defender updates automatically, but if your software is out of date, it may not be able to detect new threats.
Try uninstalling and reinstalling Windows Defender. This may fix some issues with the update process.
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To manually install Windows Defender updates on Windows 10, open the Settings app and go to System and Security. Under Windows Defender, click Check for updates. If there are new updates available, you’ll be prompted to install them.

To update Windows Defender using CMD, open a command prompt and type the following:
update-windowsdefender
If you are using Windows 10, version 1703 or later, you can also use the Update Assistant to update Windows Defender.

Windows Defender updates automatically through Windows Update, but you can also manually check for and install updates.

Windows Defender updates definitions on a regular basis, but the frequency varies depending on the version of Windows Defender and the type of device.

If you are experiencing corrupted definitions with your Symantec Endpoint Protection client, there are a few steps that you can take to try and resolve the issue. First, make sure that you have up-to-date definitions installed. If you have not updated your definitions in a while, you can download the latest versions from Symantec’s website.

Symantec offers a download of virus definitions for their products.

To manually update Symantec Endpoint Protection Manager, open the Symantec Endpoint Protection Manager console and navigate to Administration > Updates. From there, you can select the latest update file and click Install to install it.

There are a few ways to update virus definitions in Symantec Endpoint Protection Manager:
Use the Symantec Endpoint Protection Manager console.
Use the Symantec Endpoint Protection Manager command line interface.
Use the Symantec Endpoint Protection Manager Windows PowerShell cmdlet.

There are a few ways to manually get the latest antimalware updates:
Visit the Microsoft Update website and search for “antimalware” or “antivirus”. You can also use the Windows Update tool to automatically download and install updates.
Use the Antivirus and Malware Removal Tool (AMRT) from Microsoft to scan your computer for malware and update your antivirus software. AMRT is available as a free download from Microsoft.com.

To update Windows Defender definitions, open Windows Defender Security Center and click on the “Update & Protection” link in the left pane. On the “Update & Protection” page, select “Windows Update” from the left pane and then click on the “Check for updates” button. If there are new updates available, Windows Defender Security Center will show a message indicating that it has found new updates and will offer to install them.

To update your antivirus database, go to the software’s website and follow the prompts to download and install the latest update.

The first step is to try and determine what caused the virus protection update to fail. If you can narrow down the issue, you may be able to fix it yourself. If not, then your computer may need to be serviced by a professional.

To update virus protection on Windows 10, open the Settings app and go to System and Security. Under Virus Protection, click Check for updates. If there are new updates available, they’ll be listed here. Click Update to install them.