@Angel Luis Pérez
Your image save my life!
I just got the Radxa Cubie A5E and surprisingly found that this two eth ports board factory image doesn't include tun.ko
I dig some other same T527/A527 boards image but none of them has tun.ko from 5.15 kernel, except yours!
I am about to export the tun.ko to Cubie A5E's factory image to see if it works.