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You may have lost the Internet settings after doing the reset. Coordinate with your service provider and ask them to send the APN/Internet settings. This is via SMS. Once you received and opened it, hit Options > Save.
connect your phone to your PC using a USB cable, and download and install Nokia Suite in the link provided by TinyChef. then click check for updates, and if there is an update, update to the latest version offered.
if there is no update, it will say in the description to Re-Install, in faint blue coloured font. Click this to re-install your current firmware.
either, the PC installs the whole image and comes in at a much larger file download size, while updating over the phone is smaller and only updates the incremental parts. either way, your personal data will be preserved.