Despite these hurdles, the adapter is not entirely obsolete for Windows 10 users. The solution typically requires manual intervention and a bit of technical know-how. The most common workaround involves identifying the chipset inside the adapter. While Sony branded the device, the internal components are often manufactured by other companies, such as Atheros or Realtek. Users have reported success by manually installing drivers intended for similar chipsets. This involves going into the Device Manager, right-clicking the unknown device, selecting "Update Driver," and choosing "Browse my computer for drivers." From here, users must often direct the system to a previously downloaded driver file—often the original Windows 7 or 8 driver—and force the installation by selecting a compatible network adapter model from a list.
The primary challenge facing users is a and security policy conflict. Windows 10, particularly in its default 64-bit configuration, requires all kernel-mode drivers to be digitally signed by Microsoft. Legacy drivers designed for Windows 7 or Windows Vista—which might have worked with the UWA-BR100—are often unsigned or use older, deprecated signature algorithms. Attempting to force-install a Windows 7 driver for the Ralink RT2870 chipset results in Error Code 52 (The driver was not digitally signed) or Code 39 (The driver is corrupted). Even when users locate generic drivers from 2010-2012, the operating system rejects them as untrusted, effectively bricking the device for standard users who are unwilling to disable core security features like Secure Boot or Driver Signature Enforcement. sony usb wireless lan adapter uwa-br100 driver windows 10
Alternative : Use the driver from (same chipset) – available on Edimax’s support page. Sony UWA-BR100 on Windows 10: Driver Guide &