Some Verzion iPhone owners are finding their devices stuck at the Apple logo screen while trying to use the newest version of JailbreakMe. If you are experiencing this problem, Comex, the hacker who created the tool, has released this fix.
"A bug in JailbreakMe 3.0 could cause iPhone 4 (CDMA, i.e. Verizon) to get stuck at the Apple logo and be unable to boot. If you are in this situation, there are two options"
1. Hold down the home and power buttons until you see “Connect to iTunes”, then use iTunes to restore to the latest firmware. This will lose data stored on the phone.
2. Apply a quasi-experimental fix using redsn0w. Download:
Open redsn0w, select your IPSW, choose “Install custom bundle“, and select the fix bundle. Then follow the directions. If it works correctly, after installation your phone will boot normally.
"There is a separate bug where choosing “Re-jailbreak” would cause a device to be unable to boot. If you have this issue and don’t want to restore, contact me”