Create initramfs initrd img
apt install initramfs-tools -y
rm -rf /boot/initrd.img ; mkinitramfs -o /boot/initrd.img
# update-initramfs -k $(uname -r) -c -b /boot
Add to config
echo 'initramfs initrd.img followkernel' >>/boot/config.txt; cat /boot/config.txt|tail -n1
Finished
reboot