: Many 1.99 units use a PIC18F45K80 chip instead of the original PIC18F458 . While the 45K80 can work with specific bundled software, it is often non-flashable .
⚠️ Clone OPCOM units often require modified firmware to work with newer software versions. The 1.99 HEX file is commonly used for this purpose.
(or even V1.45) makes the device more compatible with various software versions like Software Match: opcom firmware 199 hex file work
It is worth repeating: [19†L32-L34】. Many such devices are essentially disposable.
The “1.99” (or V1.99) is one of many firmware version numbers that you'll see advertised on Chinese‑clone interfaces. Understanding what this version really is – and whether it can be updated – is the first step. : Many 1
If you must flash, the recommended firmware version is – not 1.99. Firmware 1.39 has proven to be the most stable and widely compatible version across different vehicle models and software releases.
Click "Test Interface" to ensure the software can communicate with the PIC microcontroller bootloader. The “1
| Risk | Likelihood | Consequence | | ------------------------------------------------- | ---------------------------------------------- | -------------------------------------- | | if the MCU is fake | Very high on “1.99” labeled devices | Interface becomes completely unusable | | Loss of FTDI pairing (the MCU is "married" to the FTDI chip's serial number) | High on newer clones | Interface no longer recognized by software | | Bootloader corruption during an interrupted flash | Medium – can be recovered if the chip is genuine | Requires hardware programmer to fix | | Voiding any warranty (there is usually none for clones) | Guaranteed | No recourse |
Hopefully, this clarifies what the Opcom v1.99 HEX file actually is and how to approach it. Are you currently trying to get a specific error code cleared or a live data stream working? If you let me know the specific issue you're facing, I can point you toward the most likely solution.
For Opcom, you will typically encounter two kinds of hex files:
Connect the interface to your car and open the OP‑COM or VAUX‑COM diagnostic software. Go to to verify that the interface is communicating properly.