It is little bit difficult work for those people who are a beginner in flashing. Flashing of the phone does at that stage if the phone is working slow or completely break with the reason of its firmware. If you will flash it with its latest firmware, your phone will be restored in its original settings.
So you will need to must take a backup of your data which is in your phone otherwise you will lose your data and phone will be restored in its original settings. You can safely recover your data to the phone after successful flashing.
Now download the latest firmware of your phone by just managing provided links below. If you are unable to get it from below links, feel free to contact us via comments.
Remember: If download links are not working, feel free to contact us, we will update download links very soon.