Yes @Ray is right Minix is not supported OOTB, it was removed in 8.95.6 as part of the unification work, sorry for my previous misleading post.
If you do the following command via SSH then the Minix remote will work.
echo "meson-ir * minix_neo" > /storage/.config/rc_maps.cfg
I have confirmed this on my own U9-H.
As for your issue with the Wetek Pro remote, I don’t have one available so I don’t know if the remote codes are the same as other Wetek remotes, if they are different then this would explain why it doesn’t work out of the box and you would need to follow the remote guide for setting it up.
On a side note, the following remote.conf may give much better responses than using meson-ir for the Tanix remote, this was pulled directly from the U9H Android image, just copy it to your sdcard and you do not need to do anything else.