Ok, so I'm on the IOS 4.2.1 on the iPhone 4. I decided to JB my phone. The JB went fine but when I tried to open Cydia, it was white and it kept crashing. So I decided it to boot it in tethered mode and when I did, the boot was stuck on the pineapple logo. I then put my phone into DFU mode and it is restoring right now. What did I do wrong? And now I'm scared to JB again but I've wanted to JB for a really long time.