Welcome to the Cayenne Community. We’ll have an update out for our Raspberry Pi agent that allows compatibility with both the 4.4. and 4.9 kernels in the near future. Just in case you need some help switching to 4.4 until then, you can do this with just one command:
sudo rpi-update 52241088c1da59a359110d39c1875cda56496764
After that runs, you just need to reboot, and you’ll be on the 4.4 kernel. You shouldn’t need to re-install Cayenne at all.