Check that your phone is set to the correct date and time. With a wrong date or time, your phone might not be able to access the updates.
Make sure you have enough free space in your phone memory to download and install the update. In case there is not enough free space on the phone memory to start the update, you will be prompted to free up space. That can be done by removing some apps or other large items, or moving them to the memory card.
Before starting the update, make sure your phone has enough battery power. If the phone battery level is too low, your phone will prompt you to charge the battery before starting the update.
If you have checked all of the above, restart your phone and then retry the update.
If you still have problems during the software update, you can try our Community to solve them.