nice goalpost switching right here. Take a true statement, then construct some strange strawman."Cars with HW2.0 cannot upgrade to FSD because they use different radar, cameras etc than cars with hardware 2.5."
Fact is there is no different radar or camera in HW 2.5. Just another computer with redundant wiring
nobody's claiming hw2.5 radar and cameras are different, just hw2.0. So hw2.0 cannot be upgraded, not hw2.5 (hw2.5 has other problems on a model3 that make upgrade somewhat unlikely).
If you are claiming hw2.0 radar and cameras are the same as hw2.5.... well, you are the misinformed one. (also the "just redundant wiring" is a lot more than that). Go check epc.teslamotors.com, watch for the before/after Aug 2017 notes to distinguish hw2.0 and hw2.5, note the different partnumbers of cameras, radar and such. Do observe the wiring changes too (I think parts of it is visible there)