– The software is searching for the interface (cable/COM port) but either:
Ensure the ftd2xx.dll file is present in the VAG Tacho software folder. If it is missing, the software cannot communicate with the hardware. : vag tacho interface not found full
plugging in the cable to some systems, or vice versa if it fails. : Ensure the vehicle ignition is in the "ON" (Run) – The software is searching for the interface
If the software detects the interface but gets stuck on "M-Flash" or asks to update firmware repeatedly, your interface firmware is likely incompatible with the software version. vag tacho interface not found full