Here is the hard truth: Nokia no longer hosts firmware files on its official servers. The Nokia Suite software (formerly Ovi Suite) used to deliver over-the-air updates, but that service was discontinued years ago. Therefore, searching for a will lead you through a minefield of fake links, ad-ridden download farms, and potentially malicious .exe files.
Even with the right , things can go wrong. Here are the most common Phoenix errors and fixes: nokia n8 belle refresh firmware download