Always prioritize the official hardware manufacturer over generic driver sites. If you cannot find an official source, use the Microsoft Update Catalog or a long-established, vetted archive like MajorGeeks. Never run random .exe files from pop-up ads claiming to have the "best free p50368v50 driver."
Downloading software from unofficial sources carries risks. Always scan downloaded files with updated antivirus software. Furthermore, flashing firmware is a "high-stakes" repair; if the power cuts out during the process, the hardware may become unrecoverable.