iPhone 3GS stuck on apple logo after jailbreak and update to iPad bb

[imean]

Hi,

i have an iPhone 3GS on iOS 4.2.1. i made the jailbreak using redsnow and also checked the update to iPad bb to unlock it. but when the jailbreak finish the iPhone won't boot and won't turn off. it's stuck on the apple logo with loading inside it.

what's the solution now??

thanks

[iYeow]

Tether boot with Redsn0w and then run GreenPoison RC4, 5 or 6 over it to go untethered jailbreak.