Fw Recovery for a TS-453D

Of curse have used alwayse the same port. But now i have a doubt.

I am wondering why, if the MAC address is mapped as 192.168.0.4 in the router, the test fw let the NAS appear in the qfinder as 192.168.0.49…of course I tried to open the old 192.168.0.4 web page but is not recognized. The blue log in page i have shown is from 192.168.0.49

At moment TrueNAS that i have installed per test is running very nice