A: The Microsoft Update Catalog or a direct MediaTek legacy archive. Avoid “driver download” websites.
Despite the lack of official branding, the hardware inside the UWA-BR100 is standard. The solution for Windows 10 users lies in bypassing the Sony-specific branding and installing a generic driver compatible with the internal chipset. The UWA-BR100 is widely recognized by the tech community as being built on the Realtek RTL8191SU platform. Therefore, the installation process is not about finding a "Sony" driver, but rather finding the correct "Realtek" driver that Windows 10 can digest. This requires a manual intervention known as "forcing" the driver or updating it via the Device Manager. sony usb wireless lan adapter uwa-br100 driver windows 10