Firmware update 1.93 did create a problem for my A6A. It no longer received audio from the LG TV (via ARC HDMI).
A Factory Reset solved the problem. “Video Initialization” may have been enough, but I used “All Initialization.”
Then in redoing all all the settings, I was glad I’d created a single-page cheat-sheet describing where all the settings are found. Attached in case it’s useful to anyone else. (You may need to adjust it to find on one page if you’re not using A4.)