E750v2 NAS

Is it possible to somehow add NAS? Exactly on 4 firmware. I need that to share files, but… Any guidance or ideas?

It‘s the same for your router:

I don’t need extroot. I especially need to use NAS. I have 99 MB free.

Then you can go this way without extroot: How to install nas functions manually

Duplicate: E750 - File Sharing Missing