and i assume you use the proper baud rate?
you can connect an isp programmer. i did so once by inserting cables at the proper locations. the question is : is the ftdi chip defect or the chip.
i would assume the chip. pity is that they used an SMD chip which is harder to replace.
one other thing : is the chip connected to other electronics ? try to remove all connections. or at least any load. And 5V from USB is still ok?
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