I kinda solved the problem, by making a new recipe (called mountpoints) starting from sierra_bit.bb but using my own folders and deleting all the sierra licenses and legato specific code, but when I add IMAGE_INSTALL += “mountpoints” on top of mdm9x28-image.inc, I get the folders but the image is highly unstable, because it’s missing some busybox-related symlinks and it keeps panicking and restarting endlessly. On another note, yes, I could overlay /opt without any problems, but /mnt contains the overlays for /home, /dev and other locations in the system. If I mount on top of /mnt the system stop working properly since now it has no overlays working.