In Schlage Express click on settings > program settings > credentials and devices.
Make sure the serial port to be used when reading credentials and programming has the correct COM port selected.
To check this go to control panel > device manager, and look at Ports COM and LPT and this will show the COM port being used. Note if you use Windows 11 this may make the port not work and you will see an exclamation point “!” next to it.
If this is the case uninstall the driver and reinstall it.
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