Reset the FaderPort. Disconnect the USB and the power cable. Wait a minute. Reconnect. It should work as usual.
The firmware 1.45 is only to fix an issue with ProTools. If you are using Studio One, you do not need to update.
If you want to update, ensure you are in fact connecting to a native USB 2.0 connection.
Know that you can use the FaderPort classic on a USB 3.0 connection, you just can't update it on them.
You can try connecting the FaderPort to another computer with USB 2.0 and attempt to update there as well.
You should also contact PreSonus Support for further assistance.