Use a small screwdriver to open the plastic casing of your OP-COM adapter. Look at the central, large square integrated circuit (IC).
Use the opcom firmware 199 hex file patched only if:
The patch often alters the internal vendor ID (VID) and product ID (PID), ensuring the device links correctly with FTDI USB-to-Serial drivers on Windows 10 and Windows 11. opcom firmware 199 hex file patched
Flashing a "Firmware 199 Patched" hex file onto a device that physically identifies as "Firmware 1.45" hardware will almost certainly destroy the device functionality unless the user is skilled in microcontroller programming and verifies the fuse settings manually.
To address the limitations and issues with the OPCOM firmware 1.99, a patched version of the HEX file has been developed. The patched firmware aims to: Use a small screwdriver to open the plastic
If you choose to walk the path of the patched 1.99, do so with a backup programmer, a spare interface, and a healthy dose of patience. And always remember: the best tool is the one that works the first time, not the one you have to hack for three days.
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Legal and Ethical Considerations Patching firmware can raise legal and ethical concerns:
: If you flash a 1.99 hex file onto a board with a "fake" PIC chip, the chip may lock up, requiring a physical programmer (like a K150 or TL866) to recover—if it can be recovered at all.