The Vcds Hex V2 Clone is a popular alternative to the genuine Ross-Tech interface, offering a potentially cost-effective solution for vehicle diagnostics. This article provides a detailed review of two different VCDS HEX V2 clones, comparing their features, performance, and potential drawbacks.
Comparing Two VCDS HEX V2 Clones
Two distinct VCDS HEX V2 clones were purchased and evaluated. The first clone utilized the Atmega162 chip, requiring a separate loader marked as malicious by virus scanners. Priced at $29, this cable was advertised as a V2 but functioned as an older HEX-CAN interface.
Atmega162 based VCDS cable – Front view
Atmega162 based VCDS cable – Back view
Atmega162 based VCDS cable – Internal components
Atmega162 based VCDS cable – USB connector
The second VCDS HEX V2 clone, priced at $49, featured the STM32F405 chip, similar to the genuine V2 interface. Notably, this clone did not require a separate loader and functioned seamlessly with the official VCDS software, even with an active internet connection. Testing revealed faster logging speeds and improved overall performance compared to a genuine HEX-CAN cable.
STM32F405 based VCDS cable – Overview
STM32F405 based VCDS cable – Internal components
STM32F405 based VCDS cable – Close-up of the chip
STM32F405 based VCDS cable – Another view of the internal components
STM32F405 based VCDS cable – Cable and connector
Further Analysis of the STM32F405 Clone
To understand the functionality of the STM32F405 clone, the chip was extracted and analyzed. The chip was locked with RDP level 2, preventing debug access. However, using a ChipWhisperer, the RDP2 protection was bypassed, granting debug access and allowing RAM dumps. While RDP1 remained active, glitching techniques were employed to bypass the RDP1 check and access the chip’s bootloader.
ChipWhisperer setup for bypassing RDP protection
Conclusion
While genuine Ross-Tech interfaces are recommended, the STM32F405-based VCDS HEX V2 clone offers a functional alternative for budget-conscious users. However, it’s crucial to acknowledge potential limitations, such as compatibility issues with future VCDS software updates requiring firmware upgrades. The clone tested functioned flawlessly with version 20.4.1. Buyers should be aware that using clones carries inherent risks and may not provide the same level of performance and reliability as genuine products.
