Changes

Inside In File Manager, browse the Download folder inside the Internal Storage to reveal the downloaded ota.zip archive.

Now that we copied the update archive in the correct location, we need to start the update process. Inside Settings, scroll at to the bottom and tap on 'About phone'.

You should then be presented with a a screen as in the screenshot below. Tap on 'Install Now' option on the left.

A confirmation dialog will then appear. By tapping  on the 'Firmware Update' button you will start the update procedure. Note the the button might be not fully visible in landscape mode.