2014-2018 Mazda 3 Skyactiv Audio & Electronics
Thanks to @Tristan-cx5 for testing.
Steps: (This assumes you have already connected CMU via Serial and TX/RX are running, and there is a COM port assigned)
1. Save this code to a file called SerialUnlock.ps1 and change COM3 on Line 11 to whatever your COM# is. For simplicity...