Pioneer avh-4200nex System Firmware Update Instructions - Page 7
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Confirm that the firmware has been updated
Perform the same procedure for "Displaying the firmware version" to confirm that the firmware has been
updated.
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].