If Windows 10 constantly overrides the FTDI driver, create a .bat file:
pnputil /delete-driver ftdiport.inf /uninstall
install ftdiport.inf
Run as Administrator before each Opcom session.
Firmware 1.67 supports:
Run this checklist:
If you answered yes to all four, downgrade to 1.67. It is the most forgiving, powerful, and stable build for that specific hardware generation.
To understand the importance of Opcom 1.67 firmware, one must understand the landscape of the late 2000s and early 2010s. Opel transitioned from simple engine control units to complex networked systems involving ABS, airbags, body control modules (BCM), and infotainment.
For owners of clone Opcom interfaces (which represent 99% of the market), firmware 1.67 is the last truly stable, fully functional version. It does not employ the aggressive anti-clone checks found in later versions.