Yamaha Aventage RX-A780 Owner's Manual page 166

Message Cause
Firmware update failed.
Update failed.
FILE NOT READY Preparation for firmware update is not finish yet.
Remedy
Press STRAIGHT and select a firmware updating method, then press INFO to update the firmware
again. For details, see the following:
• "Updating the firmware (UPDATE)" (p.152)
• "Updating the unit's firmware via the network" (p.168)
Wait a while before updating the firmware again.
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