You can flash any Nokia mobile with its latest flash files through a USB data cable. If you have flash files of your Nokia mobile phone you can flash your mobile by flashing software phoenix service. Sometimes your mobile working so slowly. At this stage, you will need to update current software or it is really important to complete flash your mobile.
Before flashing please don’t forget to take a backup of your important data like images, contacts, and messages. After flashing you will lose all of the data and your and your mobile will be restored to its original settings.
You can download the latest flash files from here.
Nokia 6700c Flash Files