The latest stable Linux kernel 4.9.1 landed in Sparky “unstable” repository.

The Sparky Linux kernel is available in Sparky “unstable” repository, so enable it to upgrade or make fresh installation.

According to small changes around sparky lists, make sure that the Sparky ‘unstable’ repository is placed in the file:
The change has been made via update of ‘sparky-apt’ 4.x package.

Follow the Wiki page: to install the latest Sparky’s Linux kernel.

Then reboot your machine to take effects.

To quick remove older version of the Linux kernel, simply run APTus-> Remove-> Uninstall Old Kernel script.