Yamaha RX-V3800 Firmware Update Procedure page 4

IN CASE OF ERROR
If "Firmware Update is complete" is NOT displayed or an error message is
shown before completion of the update, perform steps 1 to 12 all over again.
If AC power was lost unintentionally during the update process, please follow
recovery steps mentioned below to get the RX-V3800 into USB memory
firmware upgrade mode again.
If you have other problems regarding this update, contact your local Yamaha
dealer or authorized service center to update the receiver for you.
Step PL1) Unplug the AC power cable
from the back of the receiver.
Step PL2) Press the [MASTER] button to the ON position.
Step PL3) Insert the USB flash drive to the USB terminal on the front panel.
Step PL4) Press and Hold the [SLEEP] button and keep it pressed while you
plug the AC power cable back into the receiver again. Once the
front panel display shows "USB Upgrader", you can let go the
[SLEEP] button.
Step PL5) Go back to Step 7 to confirm update completion and updated
version.
Firmware Update Procedure for RX-V3800
SLEEP
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