Most versions are a mix of English and German. For example, "Fehlerspeicher" means "Error Memory". Operating System: While it runs on Windows 10 and 11, it is most stable on 32-bit systems or Windows XP/7 compatibility mode. Battery Safety: Always use a battery tender

Once connected (signified by two solid black dots for "Battery" and "Ignition"), you can perform advanced diagnostics: Read & Clear Errors:

However, for most users, the USB-to-OBD + adapter route is far simpler.