Step 1 - Download the software and unzipped
Step 2 - Then copy the three files(“apd_8257_AA_6 .75inch_SS1”,” zxdzlogo.png” and “update_dj.zip”) to root of the memory stick.
Step 3 - Insert to the USB port of the head unit ( Apple CarPlay/Android Auto port) and power on.
It will update automatically.