You might want to join the JP1 Remotes forum: [Link: hifi-remote.com]
In the "General" section there is a section called "Non-JP1". Post a thread there stating you are looking for Hex codes for a Sony XBR-77A9G Android TV. Then specifically request codes for Back, Apps and settings along with any other viable codes.
The members there have "tricks" that can find hex codes for TV's and other electronics.
BTW, "Settings" may not be on an LCD button but may actually be on the "Menu" button of the remote when one of the XBR-XXX TV's are chosen.
August 2015 is around the time that support (Database codes, firmware and any updates) stopped for the MX850.
Last edited by hdtvluvr on December 7, 2020 21:00.