Pioneer avh-4200nex System Firmware Update Instructions - Page 6
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10. Touch [Start].
Note: Images are for illustration purposes only. Actual version number will differ.
Progress status is shown.
the receiver will restart itself and return to the update screen below.)
11. Wait until the update process is complete.
DO NOT pull out USB storage device or remove power until you see the "Update Complete"
screen.
Once the firmware update process is complete, the unit will display the "Update Complete"
screen.
(Please note: Approximately one minute after the update has started,