Your Opcom interface is not just a dumb cable. Inside the plastic housing is a PIC microcontroller (usually a PIC18F2550 or similar). This chip runs low-level firmware that handles the USB-to-CAN/J1850/PWM transition.
When you install Opcom software (v1.67), the software includes a firmware file. The first time you plug in the interface, the software tries to "flash" or "update" the firmware on the device.
Here is the problem: Chinese clone manufacturers often use cheaper PIC chips or modified bootloaders. When the official Opcom 1.67 software sends a verification checksum to the chip, three things happen: opcom 167 firmware verified
Without the "verified" status, your Opcom is effectively a USB paperweight.
Subject: OPCOM 167 Firmware Verification Complete Your Opcom interface is not just a dumb cable
Status: Verified Firmware Version: OPCOM 167 Date: [Insert Date]
Summary: The OPCOM 167 firmware has undergone verification testing. All primary functions and communication protocols have been confirmed operational. Without the "verified" status, your Opcom is effectively
Verification Details:
Even with a correct hash, hardware faults exist. Perform this functional verification: