Apple has released iOS 4.3.5 build 8L1 for iPad, iPhone and iPod Touch. You can download iOS 4.3.5 IPSW from direct download links given below:
Download iOS 4.3.5 8L1
iPad 1: iPad1,1_4.3.5_8L1_Restore.ipsw
iPad 2,1: iPad2,1_4.3.5_8L1_Restore.ipsw
iPad 2,2: iPad2,2_4.3.5_8L1_Restore.ipsw
iPad 2,3: iPad2,3_4.3.5_8L1_Restore.ipsw
iPhone 3GS: iPhone2,1_4.3.5_8L1_Restore.ipsw
iPhone 4: iPhone3,1_4.3.5_8L1_Restore.ipsw
iPod Touch 3G: iPod3,1_4.3.5_8L1_Restore.ipsw
iPod Touch 4G: iPod4,1_4.3.5_8L1_Restore.ipsw
This software update fixes some security holes. If you used JailbreakMe 3.0 to jailbreak iOS 4.3.3, and didn’t update to iOS 4.3.4 firmware, you should stay away from this update.
