i have d689 too, even the most up-to-date kernel does not support such high freq. you need to patch the max2165.c
here is what i did to the file, i applied it inside the PKGBUILD because i am using archlinux
sed -i 's/780000000/802000000/g' "${srcdir}/${_srcname}/drivers/media/tuners/max2165.c" |