I notice you’re looking for a “kess 290 download new” guide. Just to clarify—KESS 290 typically refers to the KESSv2 (KTAG) 290 engine tuning tool (or possibly a clone device).
Note: If you are using a "clone" device rather than original Alientech hardware, ensure you follow specific vendor instructions regarding internet connection, as some versions can become "locked" if the software attempts to update online. How to read an ECU using a Kess v2 kess 290 download new
Hardware Connection: Connect the KESS V2 hardware to your PC using the provided USB cable. Windows should recognize the device and finish driver installation. I notice you’re looking for a “kess 290
Settings > Firmware Update..frf file included in your kess 290 download new package.