Pioneer avh-4200nex System Firmware Update Instructions - Page 2
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Displaying the firmware version
Check whether the firmware of your unit needs to be updated by checking the version number.
Procedure:
1.
Press the HOME button to display the Top menu screen.
2.
Touch the keys below in the following order.
The "System" screen appears
3.
Scroll down the list.
4.
Touch [System Information].