@Denis-Ber Omega2+ FW: v0.2.1 b199
-rw-r--r-- 1 root root 61 Oct 18 19:23 /etc/fstab
-rw-r--r-- 1 root root 61 Oct 18 19:23 /rom/etc/fstab
BTW According to the official Onion Omega2 Documentation you should edit the '/etc/config/mountd' file.
If you’d like to change where the MicroSD card is mounted on the filesystem, we’ve written a guide covering how to do so for both MicroSD cards and USB drives.