Make sure to DO NOT root your handset by yourself or without any knowledge. The process may damage the device system and your device warranty will void immediately (if any).
The firmware updating process will take some time. So, please be patient.
It may delete all of the device data (internal) completely such as contacts, messages, documents, etc. Make sure to take a full back up of your important data before doing anything.
Keep the phone battery juice above 50% or you can plug your device into charging as well.
Connect your device to a working Wi-Fi network for faster and stable software updates.
