WARNING: Before perform firmware update, always perform phone backup! The author will NOT be held responsibility under any circumstances.
1. Settings > Software update > Download and install > Download
2. Downloading update...
3. Install now
4. Android system update > Auto Reboot > Update (Android icon) (%) > Auto Reboot
5. Phone is updating... > Optimising apps (%)
6. Login to the phone > Finishing system update...
7. Software update > OK
URL: https://www.samsung.com/my/support/mobile-devices/what-is-new-in-one-ui-4-0/
