Model Code : 77S1


Secondly, please check your current system version.


System version of your car audio Download page's Link
77S1.03.50 No update required as it is the latest version.
77S1.03.00 Go to the download page
77S1.02.03 Go to the download page


How to check current system version


USER Manual image 3
System Version : aaaa.bb.cc
Note: Above shown image is for reference purpose only.