JB VZW Iphone 4 (4.2.8) loader flashes but won't install
I'm having some huge difficulty trying to find working directions to jailbreak my Verizon iPhone 4 running 4.2.8. I found a link that told me to use greenp0ison and i followed it. It said I successfully jailbroke it and it created the loader icon. However, when i click the loader icon, nothing happens. It acts like the screen will open up a new app, but it flashes and goes back the same screen. I have rebooted many times, i have re-JB'd, even had to restore my device because i got it stuck in recovery mode. So currently i'm still stuck with the loader icon that won't install Cydia. I've seen many people have this issue but i never saw what the fix was. What is the fix?
Is there a foolproof way to JB 4.2.8 ?