Changes
/* Serial IO (UART, GPIO) */
=== Serial IO (UART, GPIO) ===
* [http://fit-iot.com/files/download/fitlet2/sw/drivers/win10/fitlet2_Win10_TXEfitlet2_Win10_SerialIO.zip Serial IO driver]
** Driver version: 5.3.6.1839
** Upload date: 2018.10.03