Temporarily disable driver signature enforcement:

The (often sold under generic "USB 2.0 to RJ45" labels) is a popular, low-cost solution for adding a wired Gigabit Ethernet port to laptops, ultrabooks, and desktops missing a native LAN jack. However, its Achilles’ heel has always been driver support —specifically the elusive "Driver 21" variant. Unlike standard drivers bundled with Windows, the "21" series drivers solve specific compatibility glitches, including random disconnections, slow speeds, and driver signature errors.

Before discussing the driver, it is crucial to understand the hardware. The model number "JP1081b" is not a major brand name like Realtek or Intel. It is a generic identifier for unbranded USB-to-Ethernet adapters manufactured in China.