Is it because that the mac mini late 2014 that i have obsolete

I have try many possibilities at my end. And still there is no connection to the apple server that the Internet Recovery with the spinning globe is not working so as that to the Apple Hardware Diagnostic Test.

Even updated to macos big sur 11.6.5 it still cannot do a AHT test and Internet Recovery Test. And it still giving a -2002D, -2002F and -5101D test error. Even I clear the nvram with sudo nvram -c on the terminal. And it still does not work at all.