Open Device Manager . Look under "Universal Serial Bus controllers." If you see "J-Link Driver" with a yellow exclamation mark, right-click and select "Update driver." Usually, pointing it to the Segger installation folder ( C:\Program Files\SEGGER\JLink ) resolves this. 2. Driver Conflicts
You should never download JLinkx64.sys from "driver download" websites, as these are often bundled with malware. The only official way to update the driver is to: Visit the Segger Downloads page . jlinkx64sys
Understanding JLinkx64.sys: The Core of Segger J-Link Communication Open Device Manager