The command to load the kernel snap is :
#snap install Snapped 96boards-kernel_XXX_arm64.snap --dangerous
Once in a while there is error in loading the kernel, in that case below workaround can be used.
Get the name of existing kernel snap
# snap list kernel-name
Back up the existing kernel
# cp /var/lib/snapd/snap/kernel-name-version1.snap ~/
Replace the developing kernel to current kernel snap.
# sudo cp <new kernel snap> /var/lib/snapd/snaps/kernel-name-version1.snap
Reboot the system and test it
# sudo reboot
If it doesnt boot up, restore the old snap.
# sudo cp kernel-name-version1.snap /var/lib/snapd/snaps/kernel-name-version1.snap
