Re-open Device Manager. The device should now appear under Human Interface Devices or Sound, video and game controllers with a proper name (e.g., “USB Gamepad” or “kp206b-ub Controller”).
Because the KP206B-UB is likely a clone of either the WCH CH340 or Silicon Labs CP210x series, try these: kp206b-ub driver
A: Yes. On macOS, the system may recognize it automatically as tty.usbserial after installing the CH340/CP210x driver. On Linux, it often loads the ch341 or cp210x kernel module without extra drivers. Re-open Device Manager
Solution: The .inf file may be for an older OS. Right-click the .inf file, select Properties, go to Compatibility, and run the installer in Windows 7 or 8 mode. On macOS, the system may recognize it automatically as tty
If you’ve landed here, you probably have a KP206B-UB in your hand and absolutely zero documentation to go with it. Welcome to the club.
I picked up a batch of these from a surplus auction, labeled only as "Stepper Controller." No pinout, no voltage rating, no website on the silkscreen. After a few hours of bench testing, multimeter beeping, and a little bit of magic smoke (none escaped, thankfully), here is what I figured out.
Warning: Avoid "driver updater" software or third-party ad-filled websites. Many of these sites bundle malware. Use the following trusted methods.