Pioneer AVH-X4700BS System Firmware Update Instructions - Page 4
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2. Connect the USB storage device to the USB input on your unit.
3. Set the audio source to "OFF" on your unit.
4. Press the [Home] button.
5. Touch the keys below in the following order.
The "System" screen appears.
6. Scroll down the list and touch [System
7. Touch [Firmware Update].
The "Firmware Update" screen appears.
8. Touch [Continue] to display the data transfer mode.
information].