There are a few ways to update virus definitions on Android devices. The first way is to use the Google Play Store’s built-in updater. To do this, open the Play Store and type “update” into the search bar. Once you’ve found the update, tap it and select “download.” After you’ve downloaded the update, open it and install it. The second way is to use a third-party updater. To do this, open a browser on your device and type “update” into the address bar. After you’ve typed in the URL of the update, click on it and select “download.” After you’ve downloaded the update, open it and install it. The third way is to use a custom updater. To do this, open a browser on your device and type “update” into the address bar. After you’ve typed in the URL of the update, click on it and select “install.” After you’ve installed the update, open its installer and follow its instructions to install it.