Sorry for not explaining right.
Connecting to NAS via its web site (dashboard) - is OK for all platforms.
Windows & Mac machine can not connect/ Map a share, as if something is not defined as needed.
Since nothing was changed (same cables, PCs, LAN, router) before restore, I’m sure it has to do with NAS’s properties
OK, so you can access the dashboard but not the files. Check the network settings on the NAS dashboard/menu. In windows, if you can see it at the bottom of the page under “storage”, that gets you to the dashboard. If it’s not at the top of the page, under “computer” then that’s why you can’t access the files. Is the “Public” folder shared? Go to “Shares” on the dashboard and make sure “Public” and “Media Serving” are turned on. Have you tried setting the NAS up as DHCP? SNMP to “all”?