Now you can Jailbreak all iOS using latest version of RedsnOw. You can free download RedsnOw 0.9.6b3 to jailbreak iOS. The hardworking Dev Team finally release the latest version of RedsnOw 0.9.6b3 which has power to Jailbreak almost all iOS including 4.2.1. Remarkable powers of this version of Redsn0w are SSH and SSL support though which you can install apps without Cydia. You also know that still Cydia don’t work with iOS 4.2.1. So the developers of RedsnOw take the best advantage of it and built the app on behalf of RedsnOw 0.9.6b3 which don’t need Cydia for iOS 4.2.1.
Download latest version of RedsnOw 0.9.6b3 to Jailbreak iOS 4.2.1 from the links given below.