If 1.67 causes problems (e.g., lost connection, ECU read errors), revert to your old version:

Important: Never flash firmware from a different brand (e.g., VXdiag) into Opcom.

Opcom is a diagnostic interface (hardware) that communicates with your vehicle’s OBD2 port. However, the hardware is useless without firmware—the embedded software that tells the device how to talk to different car modules (engine, ABS, airbag, transmission, etc.).

Firmware 1.67 refers to a specific version of this onboard software. It was released to address several bugs present in earlier versions (like 1.45, 1.54) while introducing improved support for newer Opel/Vauxhall models produced between 2008 and 2013, including:

Unlike later versions (1.79, 1.99, or 2.x firmware), version 1.67 is often praised as the last truly stable release before counterfeit hardware compatibility became problematic.

Try using Wayback Machine on old forum threads, or search for "Opcom 150317a full package".

⚠️ Clone hardware variability – Not all Opcom clones are identical. Some have different PIC microcontrollers (16F886 vs 16F887). Firmware 1.67 may brick certain clones.

⚠️ Bricking – A failed firmware update can render the interface unusable (no LED, not detected). Recovery requires a programmer (PICkit).

⚠️ Vehicle damage risk – Incorrect firmware can cause wrong voltage on OBD pins, potentially damaging ECUs.

⚠️ No official support – You are on your own. No warranty.

✅ Mitigation:

| Problem | Possible Cause | Solution | |---------|----------------|----------| | “No communication with interface” | Driver not installed correctly | Repeat driver installation with signature enforcement off | | Firmware update fails at 50% | Clone with small buffer | Try flashing using a 32-bit Windows 7 VM | | Vehicle scanning freezes | Incompatible car model (e.g., 2015+ Insignia) | Use version 1.45 for older cars or 1.79 for newer | | Cannot program keys | Immobilizer password missing | Use “Security Access” feature with PIN from Opel dealer database | | DPF regeneration aborts | Incorrect battery voltage | Connect a stable 13.6V power supply to car battery | | ABS bleed fails | Wrong bleed routine | Double-check vehicle variant in Opcom (not just model) |

Due to legal reasons, I cannot provide direct download links, but here are reliable sources used by the community:

No. Only update if you have communication errors with certain modules.

| Source Type | Example | Safety Rating | |-------------|---------|----------------| | Automotive forums (Digital-Kaos, MHH Auto) | Digital-Kaos threads post-2020 | Medium (user-uploaded) | | Telegram diagnostic groups | Opel Diagnostic Channel | Medium | | Original CD images from reputable sellers | Some eBay sellers include .iso files | High (if verified) | | GitHub (rare, but some mirrors) | Search “opcom firmware 1.67 bin” | High (open source community) |

Legitimate note: The original manufacturer of Opcom (Vetronix, later Bosch) no longer supports this device. Therefore, downloading firmware 1.67 is in a legal gray area. Use only for educational or vehicle ownership purposes.