: Works with Opel, Vauxhall, Holden, and Chevrolet models from 1987 to roughly 2021.
I sourced the "Opcom 167 Firmware v1.67 Pro." This version fixes the CAN timing issues. However, it expects a specific oscillator calibration. Using a hex editor, I modified offset 0x1F80 to bypass the signature check (changing 0x0A to 0x00 to ignore the vendor ID mismatch). opcom 167 firmware work