How to modify FTDI default .INF without needing digitally signing again?

  driver, ftdi, serial-port, signing, windows

I need to modify the default latency on the FTDI drivers as it often gets reset when the device gets reconnected, but when I modify the default configuration file I get an error from windows saying that "The hash for the file is not present" and suggesting it has been tampered with.

It HAS been tampered with, but only the latency default value (usually 16). The FTDI APP Note (section 6.3) suggests it should be as simple as modifying that value, but it seems not!

Does anyone know if this can be done without paying for it to be digitally signed? The intended PCs for it to run on cannot have the digital signing check disabled due to security protocols, but if devices get unplugged and reconnected they will likely fall back to default latency and it will cause a lot of headaches…

Any help hugely appreciated guys.

Additional info:

  • Windows 10 x64 bit system
  • Using the drivers from FTDI Website

Source: Windows Questions