Along with iOS 4.3.5, Apple has also released iOS 4.2.10 for Verizon iPhone 4, the CDMA iPhone. You can download iOS 4.2.10 for CDMA iPhone 4 from the link below.
Apple pushed the 4.2.10 firmware update only about 10 days after the availability of iOS 4.3.4/iOS 4.2.9. iOS 4.10.2 patches certificate validation vulnerability. iSO 4.3.4 and 4.2.9 were released to patch JailbreakMe 3.0 exploit that was based on Mobile Safari to jailbreak iPad 2.
If you want to keep your untethered jailbreak on iOS 4.2.8, we strongly suggest your to stay away from iOS 4.2.10, iOS 4.2.9, iOS 4.3.4 and iOS 4.3.5. Make sure you install PDF Patcher 2 from Cydia after 4.3.3/4.2.8 unterthered jailbreak to patch PDF vulnerability.
How to Isntall iOS 4.2.10
Connect your Verizon iPhone 4 to iTunes, new firmware 4.2.10 availability message will appear then hit the “Download and Install” button. (Not recommended for jailbreakers)
You can also download iOS 4.210 firmware from the links below. Hold down the Shift (Windows) or Alt/Option (Mac) key and hit the restore button on iTunes and select the downloaded IPSW file.
Download iOS 4.2.10 for Verizon iPhone 4
- Download iOS 4.2.10 for Verizon iPhone 4 CDMA (iPhone3,3_4.2.10_8E600_Restore.ipsw)
Other iDevice owners should download iOS 4.3.5 instead: