What are you trying to diagnose?
Always connect a clean, dedicated automotive battery maintainer (supplying at least 30-50 Amps) to the vehicle during diagnostics and flashing. A voltage drop below 12V mid-flash will brick the ECU. Odis 7.2.1
ODIS 7.2.1 may fail to recognize that a vehicle’s ignition is turned on, preventing diagnostic sessions from starting. This can be caused by: What are you trying to diagnose
Windows 10 (64-bit) is highly recommended for maximum driver stability. Processor: Intel Core i5 or equivalent (Minimum 2.0 GHz). Odis 7.2.1