OEM 8inch Vehicle does not need Metal Decoder Box
OEM 4inch Vehicle Need to connect the Small green Square Board
https://youtu.be/COrwUf28eQY?t=343
For installation - Use the T-Harness to connect Factory Unit between Our Unit
Need to use the Mini USB Plug (LVDS Cable)
Car Type - Car Info
GM - A, C, S, X, E
ATS
GMC Sierra
Silverado
XTS
Escalade
Set Car Type to GMA
Car Info set to Hi for 8 inch, Lo for 4 inch
Press and hold Mute button for Restart