A dedicated firmware flashing utility, such as or OCFlash . The verified OPCOM firmware 1.99 HEX file . Step-by-Step Installation
Before downloading any HEX files or tools like OP-Flash , you must verify what microchip is hiding inside your plastic OBD2 case.
: For a successful flash or stable performance, your device must have a real PIC18F458 microcontroller
Connect the five ICSP wires from your PICKIT2 to the PIC18F458 chip: opcom firmware 199 hex file work
Most version 1.99 clone cables are deliberately locked. The manufacturers flash a modified firmware onto the microchip and disable the bootloader so you cannot downgrade or upgrade the device. The Truth About the 1.99 HEX File
Sometimes, if you plug a 1.99 device into older software, the software tries to "downgrade" it, resulting in failure. Ensure you are using the correct software version.
If the tool connects to the instrument cluster but fails to read the engine ECU: A dedicated firmware flashing utility, such as or OCFlash
Find instructions for using a to unbrick the device.
Downgrade to firmware 1.39, which is considered the best version for Corsa C compatibility. Note that downgrading carries significant risks and should only be attempted on flashable interfaces.
: It is typically paired with Vaux-Com 120309a . Users often find that version 1.99 does not work with newer software versions like 2012 or 2014, and may actually have less functionality than the more stable version 1.70. How to Use the Hex File : For a successful flash or stable performance,
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Most high‑quality clones designed to be flashable use the microcontroller. However, a large number of "Opcom 1.99" units are actually Revision B hardware that is not intended to be updated. If your interface has the FTDI chip with VID 0403 and PID 6001, it is more likely to be a proper clone, but the MCU is the real deciding factor.
Opcom 1.99 requires a specific USB-to-Serial driver. If you use Windows 10/11’s automatic driver, the HEX file upload will succeed, but the software will crash when you try to read an ECU.
The hex file will only work if the hardware chip supports it. OPCOM clone interfaces generally feature one of two chips:
. Many cheap 1.99 clones use "fake" or "locked" chips (like the PIC18F45K80) that are often "one-time programmable." Bricking Risk
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