Here we share the method to update GM MDI Scan Tool Hardware.
item: New Wifi GM MDI Scanner Multiple Diagnostic Interface with SPS Software with WIFI Card from CnAutotool.com
1. firstly press this button like the picture showed, and then connect to power adapter, unloose the button until all the five leds are flashing.
2.second click gm mdi manager.
3.At last click Mdi update.