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Dear All, I have looked for on this forum an answer to this question : it seems complicated and also depend of the MAC OS version. In fact, my team has developed an USB device. This device works on Windows OS. We have sold the product, it works on different OS versions (7, 10 and 11) This device works also on raspberry PI (linux core). Into these both OS, the product is detected like a serial port : I can use basic application of check that my product is perfectly functional. Now I want use it on MAC OS, my device appears into the list of USB components connected to my MAC. However I'm not able to indicate (or force) the serial port. I read lot of things, kext? ,,, could depend of MAC version however I cannot found a clear process to help me to install a virtual COM on my MAC OS. Do you have link to other forum (more hardware may be)? Do you have any technical documentation about this topic? regards, fu154