This is one reason my tag lines contain "WiFi is for convenience, hardwired is for performance."
Nobody wants to believe it, though. DO NOT try to update anything via WiFi. Not even a toaster. If possible, save the update to a USB drive and preferably, save the configuration before updating.
For anyone with a Yamaha, find the IP address and enter that in the search bar of your browser with /setup at the end. An example would be 192.168.1.45/setup or with an Apple router, 10.2.2.45/setup
Setting it up will be far easier and you can adjust all settings without using the TV or the LCD screen on the face. It looks like the pdf, but the real thing will have a pale yellow background. This is from my Yamaha WXC-50 MusicCast device- the file called Control center is found using the gui from the saved page, the setup is found using the instructions above. If you see 'To Web Control Center', click on that to find the Save and Restore buttons.
FWIW, my MusicCast is about 6 years old and I don't have a current model AVR, so the gui may be different. If it is, contact Yamaha to find out how to save/restore the config using a browser.