In January 2016 Samsung Galaxy S4 suddenly got an update for Android 5.0.1. The update contains the vulnerability patch, battery usage optimization and security improvement.
How to download and install the update
Connect to your WiFi.
Go to Software updates, tap on Check now. You will probably see this:
After you download the update you will see some information about it:
After you press Install your phone will reboot and start installing the update:
After the progress bar reaches 100% you will see “Optimizing app…”. It may take quite a long time:
After update installation
A new window prompting to force stop or uninstall the app which is draining the battery:
ANother notification concerning optimization:
New app called Smart Manager. Here you can for example clean RAM, storage and decrease battery draining:
New Android security patch level field in About device: