Along iOS 4.3.4 firmware update Apple also released iOS 4.2.9 firmware for Verizon’s CDMA iPhone 4, which could be downloaded through integrated link after the break.
The iOS 4.2.9 update fixes the PDF vulnerability issue which is used in JailbreakMe 3.0 by Comex to jailbreak iOS 4.2.6-4.2.8 on CDMA iPhone 4.
Note: If you have iOS 4.2.8 jailbriken or unlocked iDevices then you should not go for iOS 4.2.9 update.
Download iOS 4.2.9 for iPhone 4 (CDMA)