I just updated mine to marshmallow using the sony_tvupdate_2015_3709_nab_auth.zip from a USB stick. Everything seemed to go fine. My about screen looks the same as his.Can you confirm the marshmallow update package that came installed on yours is the same as the guy a few posts earlier was saying is the same as the 940C? PKG3.709.0120NAB. He updated his manually with the 940C marshmallow update and said it went fine. Should be under help to find the package installed.