Can't get 6in4 tunnel working

Although kmod-sit is installed now without any issue, dmesg | grep sit returns empty. I suppose this is the reason I can't get 6in4 tunnel working. How could I fix it?

I removed kmod-sit and 6-in4, then added them again. Still lsmod | grep sit does not return anything.

root@OpenWrt:/etc/config# opkg list-installed | grep 6in4
6in4 - 26
root@OpenWrt:/etc/config# opkg list-installed | grep kmod-sit
kmod-sit - 5.4.94-1

modprobe sit

Nothing returned after modprobe. I even searched in /proc/modules for sit but it is not loaded. I found this:

root@OpenWrt:/lib/modules/5.4.94# modinfo sit.ko
filename:       /lib/modules/5.4.94/sit.ko
alias:          netdev-sit0
alias:          rtnl-link-sit
license:        GPL
depends:        ip_tunnel,tunnel4
intree:         Y
name:           sit
vermagic:       5.4.94 SMP mod_unload aarch64
parm:           log_ecn_error:bool