As I just learned the hard way NETGEAR updated the kernel with ReadyNAS OS 6.5.1 but didn’t change the kernel version number. The changes weren’t big ones but enough to make the old kernel modules from the 6.5.0 package refuse to load. So I made a new package with again updated drivers. The new kernel modules are available here:
The download includes all kernel module packages I have built for the various ReadyNAS OS 6 releases.