Software update is the official system application on HUAWEI devices with Android. This app is in charge of checking if your device has the latest software version installed. If the device doesn't, it notifies you that there is a new one available and downloads it.
Before downloading it, the app shows you what is new in the update through its corresponding list of changes. In most updates, the main changes are security patch updates to the latest version available from Google. These patches fix security flaws of varying severity in your devices and it is important to keep up to date with these updates.
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After downloading the update, Software update displays the "Install Now" option. When you click on it, the device will restart to install it correctly. After rebooting, the device will be fully operational if everything works correctly.
In case you mistakenly uninstall the Software update APK from your device, then you will not be able to receive software updates released by the company. Therefore, if you want to keep your HUAWEI device up to date with the latest Android updates, it is important to have the Software update APK downloaded.