Jailbroken 3gs

[paulnile]

Hi have an iPhone 3GS on 4.2.1 bb 06.15.00 connected to iTunes and now it is stuck on the iTunes logo tried restoring but errors in iTunes I I have shah saved with Cydia and have changed the host files in iTunes any help would be appreciated

 

[bab2010]

What is the error code displayed by iTunes? Or only the recovery screen that's all?