Sorry, but give up now.
You need a VM/Boost/Sprint 4g phone or wifi hotspot in good standing to access the 4g network. Even if you have the radio, you don't have a 4g enabled account.
What you are doing is the equivalent of logging into a neighbors locked down wifi. Just because you have wifi doesn't mean you will have access.
There is three ways you can do what you are after...
A. Clone a 4g phone's 4g settings or a 4g wifi hotspot's settings, one with a good, active account. Of course this is illegal and you still need the radio and the knowledge of how to integrate it in terms of hardware and software, and cloning experience... It also means buying a 4g phone, or buying a 4g hotspot AND paying for both phone and the hotspot.
B. Buy a 4G wifi hotspot, and just tether it to your phone. This requires buying a 4g hotspot and paying for your phone and hotspot service. Easy and completely legal, but not cheap. Netzero will let you get 200 megs a month free on 4g, more costs money, and you can't input the settings into a phone, at least those who tried have failed (besides being illegal and only 200megs).
C. Just get the Evo 4. You buy one phone, pay one bill.