I'm using redsn0w 0.9.5b5-5 and the iOS 4.0.2 firmware (iPod2,1_4.0.2_8A400_Restore.ipsw) for iPod Touch 2G (8GB MB model) downloaded from Apple through iTunes. redsn0w says it is "unable to recognize specified IPSW." Any ideas?
No, it's not. redsn0w has not been updated to recognize the iOS 4.0.2 firmware yet. However, pointing it to iOS 4.0 will do the same thing as it should.