Genuine Ross-Tech VCDS (Vag-Com Diagnostic System) cables are the gold standard for Volkswagen and Audi diagnostics. However, their cost can be prohibitive for some users. This leads many to consider knockoff VCDS cables, often significantly cheaper. This article details a hands-on experience with two different knockoff VCDS cables, highlighting their functionality, potential risks, and comparing them to the genuine Ross-Tech offering.
Exploring Two Different Knockoff VCDS Cables
Two distinct knockoff cables were purchased and tested: one based on the Atmega162 chip and the other on the STM32F405 chip.
Atmega162-Based Cable: A Disappointment
The Atmega162-based cable, advertised as a V2, turned out to be a HEX-CAN cable (an older generation). Priced at $29, it required a separate loader executable flagged as malicious by VirusTotal.
Interestingly, the genuine Ross-Tech HEX-CAN cable also utilizes the Atmega162 chip.
However, the knockoff’s malicious loader necessitates running it in a virtual machine for safety. This cable is ultimately not recommended due to its outdated functionality and security risks.
STM32F405-Based Cable: A Functional Surprise
The STM32F405-based cable, priced at $49, presented a surprising contrast. It functioned without a separate loader or modification to the VCDS software. While the included instructions advised disconnecting from the internet, it worked flawlessly with an active connection.
This cable exhibited faster logging and data access speeds compared to the genuine HEX-CAN cable. Further investigation revealed the STM32F4 chip was locked with RDP Level 2 protection. This protection was bypassed using a ChipWhisperer tool.
A video demonstrating the process is available: https://youtu.be/4JFo23tYOq0
Conclusion: Genuine vs. Knockoff VCDS Cables
While the STM32F405-based knockoff provided surprisingly good functionality, it’s crucial to acknowledge the inherent risks of using counterfeit products. Compatibility with future VCDS software updates is uncertain. Firmware updates for the cable are unlikely, limiting its long-term viability. It’s highly probable that this knockoff will only work with the provided, unmodified 20.4.1 version of VCDS software. While a budget-friendly option in the short term, genuine Ross-Tech cables offer guaranteed compatibility, support, and regular updates, making them a worthwhile investment for serious users. Ultimately, the decision rests on individual needs and risk tolerance.
