Driver signing can be disabled via an elevated Command prompt, but that requires disabling Secure Boot. I have to go through the Windows Startup Menu again to disable driver signing again. That lets me install the COM port driver, and the device works properly after that, but when I reboot the device is back to being a USB Serial Converter with the exclamation point, no doubt because the driver installation fails. I'm disabling driver signing from the Windows Startup menu (accessed via Shift-Restart). I was able to get an FTDI-based USB serial port working under Windows 11 on my 14" Mac M1 Max, but I have three problems: 1) the device driver install isn't persistent across reboots, 2) I can't give the COM port the name I want, and 3) my multiport USB-to-serial adapters aren't recognized by MacOS. Thanks for your very helpful instructions. I am looking forward to a version that doesn't require disabling Windows 11 driver signing as I use the COM ports frequently. I tested serial communications with my Vantage whole house automation controller over COM3 and it worked. Those extra steps did the trick for a working driver. Reinstall its driver from the same package A new USBtoSerial device will appear with Excalamtion signġ2. Take out the adapter and insert it againġ1. Give it a value COM4 or any free valueġ0. Create a new string value named PortNameĩ. Where VID_0403
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