| Firmware | Pros | Cons | |----------|------|------| | | Most stable, J2534 compliant | Hard to find clean sources | | 1.4.8 | Better for K-line (pre-2003) | Buggy USB reconnect | | 2.1.0 | Supports more J2534 functions | Causes Techstream to freeze | | OpenPort 2.0 (Tactrix) | True pass-thru, open source | Expensive ($200+) |