Nice job!
I think we can easily fix it, I remember a similar issue on NS7 fixed by @dz00te.
I reused his code for the fix, you can test it in you machine.
Access the firewall with SSH then execute:
curl https://raw.githubusercontent.com/NethServer/nethsecurity/refs/heads/fix_dashboard_raspberry/packages/ns-api/files/ns.dashboard -o /usr/libexec/rpcd/ns.dashboard
If there is any other problem, let me know and we will try to fix it.
Edit: I forgot to mention, this is the draft PR for the fix: ns-api: fix hardware info for ARM boards by gsanchietti · Pull Request #873 · NethServer/nethsecurity · GitHub