Reliable 1.67 firmware typically requires a high-quality PCB with a PIC18F458 chip. Clones using the cheaper PIC18F45K80 chip often fail or "brick" if you attempt to update them. OpCom software issue - Vauxhall Owners Network Forum
If you need help setting up your diagnostic tool, please let me know: opcom 167 firmware work
Opinions on OP-COM in forums reflect a clear consensus: for the dedicated DIY Opel owner, it's an indispensable tool, but quality matters immensely. Reliable 1