I have a LENOVO A6000 running KitKat and I want to update it to Lollipop. I have important pictures and videos on my mobile.
Will my data be deleted or remain the same if I update my mobile?
If you're updating through your phone via an official update, the data will not be deleted...
However, if you're trying to update it manually it MAY be erased and you will need to take a backup
It depends on your method of updating or upgrading.
If you're doing it directly from your phone, officially, from within the settings, then your data is fine.
If you're flashing a ROM or using such method, then unless you backup, your data will be deleted.