Vero 4K+ nat-rtsp dkms

I follow [TESTING] Linux 4.9 kernel and improved video stack for Vero 4K / 4K + I added to /etc/apt/sources.list:

deb http://apt.osmc.tv videoimprovevero49 main

and dist-upgrade

Now i have a system unable to do anything, the network is slow too slow, i can’t play anything with nfs and another machines conected to the same switch is affected

how can i get back safely to the old kernel?