1) Please download the firmware in the link as above to your computer(PC).
2)Extract the downloaded file and get two files( "dmcu.img" and "update.zip")
3) Copy the two extracted files to the root directory of the sd card(it is very important,otherwise the system can not detect the firmware image).
4) Plug the SD card into the unit.
5) Go to the menu of Settings==>System ==>MCU updates
6) Go to the menu of Settings==>System ==>System updates, remember select the option of "wipe data and format flash!".
After the updating complete. Please note the first booting time after system updated will get a little longer.Please be patient to wait and please do not cut the power when the system is updating or the head unit is booting.
7)You can delete dmcu.img and update.zip file in the SD card after system updating finished.
8)Install iGO app from the SD card again.
Path: APKINSTALLER-->INSTALL-->GPS CARD--->iGO_Pal--->iGO719WD.apk
This firmware only fits SYGAV car stereos head unit with PX5 cpu and Android 8.0 system. Don`t try to update this firmware to any other android car stereo that will cause the system collapsed and can`t be saved back.