Oh, I just thought of another couple possibilities...
1. You just have the wrong Com port#.? I assume you did the check of running the device manager, plug in the nano, and see the new com port?
2. Any chance something else has grabbed the Com port? For example if you have the Arduino IDE running and you have the Serial Monitor in focus, it will grab exclusive access to that port and other readers will fail.?
3. Unplug everything, and reboot you machine. I know it is the sledge hammer approach, but I have had software not cleanly release ports (perhaps my own ;-) ) and once that happens, no other software can access that port. Always timeout.
Not surprised that the Settings Editor timed out. It needs to talk to a functioning CEC release (any release). If you were not able to install CEC onto Nano, then the SE will send a request for data, and eventually time out when the Nano on the other side ignores it.
73
Mark
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AJ6CU
KD8CEC 2.0, Nextion Screens,? and open source uBITX Raduino boards for Arduino IOT, BLE, RP2040, Teensy 4.0, and Raspberry Pi Pico
https://github.com/aj6cu
