Extract the "Kess V2 5.030" folder to C:\Kess. Avoid long directory paths or desktop folders, as they can confuse the virtual COM port drivers.
Before version 5.030, OBD2 reads could take over 30 minutes for a large ECU (e.g., 4MB Bosch EDC17). With optimized drivers and buffer management, Kess 5.030 reduced average read/write times to 8–12 minutes, with a near-zero dropout rate on stable power supplies. Kess 5.030
To turn Kess 5.030 into a professional tuning tool, combine it with complementary software: Extract the "Kess V2 5