System Firmware Update Instructions for AVH-4000NEX
Please download and print these firmware update instructions before downloading and installing the
firmware update. It is important that you complete all steps correctly and in the order described below.
In order to perform this update, you will need a blank SD card or USB storage device, 2 GB or larger in
capacity, formatted to FAT32.
The only USB port that supports the firmware update is USB port 1.
DO NOT turn your unit off, eject the SD memory card or disconnect the USB storage device while
the firmware is being updated.
You can only update the firmware when the vehicle is stopped and the parking brake is engaged.
Displaying the firmware version
Check whether the firmware of your unit needs to be updated by checking the version number of the
Press the HOME button to display the Top menu screen.
Touch the following keys in the following order.
The "System" screen appears
Scroll down the list.