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An unrecognized or "Ross-Tech HEX-CAN USB" marked with a yellow exclamation point.

The VCDS software loads, the cable is recognised in Device Manager, but the test returns “No Response from Controller” or “Interface Not Found”.

A: Ross-Tech officially only supports their $300+ genuine interfaces. The driver for the VAG 908 clone is a reverse-engineered or FTDI generic driver. Ross-Tech does not provide support for clone cables.