I have an iPhone 3Gs previously jailbroken with PwangTool on 3.1.2. I successfully jailbroke it again with PwangTool 4 but like many my iBooks is not working. I understand that PwangTool 4.01 will fix this. PwangTool 4.01 says it can't find my ipsw file. When I go to the Expert mode and try to use my ipsw files it says "wrong firmware bundle selected". I have downloaded a generic ipsw from the net but this does not work either. Any ideas?