Hello
You need to do some more hardware modifications as well
To change the fake MCU with a real programmed one it's not enough.
What version of opcom are you using?
Whats your driver VID/PID?
It must be 0403/6001 if you are using vauxcom 120309a or 0403/4F50 if you are using OPCOM China clone 2010 software only.
But could be anything else defective in the hardware.
Check also the connectivity of TX/RX between FTDI and PIC18F458
Check if the PIC is soldered well
Check the MCLR
What to say more? I cannot write here all you have to do when you have a defective interface if I don't have it in my hands
Good luck
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