I have used all of the most known jailbreaking programs out there, such as Redsn0w, Evasi0n, and Sn0wbreeze. When I use Redsn0w I either get two errors. One is the "Failed to decrypt kernel" error. And the other one is "Missing keys.plist" error, even though I'm using all the right ISPWs. Evasi0n just doesn't flat out work. And I never get past the DFU Pwner on Sn0wbreeze, even though I'm doing it right. I've tried downgrading from iTunes but I got the "Failed to restore" error. I don't know how else I can downgrade. Should I just except the fact that my iPhone 4 is unjailbreakable and undowngradable, or should I keep trying to figure out a way to downgrade or jailbreak?